Secrets of the Moon’s Permanent Shadows Are Coming to Light | Quanta Magazine

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Studies so far have provided a tantalizing glimpse at best. But that’s about to change. Next year, robotic vehicles will enter the bewildering icy depths of PSRs for the first time, revealing what the interiors of these shadowed craters look like. By the decade’s end, NASA plans to send humans to explore in person.

On the eve of this new era of moon landings, a slew of fresh studies of PSRs have revealed that these shadowed regions are even stranger than scientists imagined. What will we find lurking in the shadows?

“I don’t know what we’re going to see,” said Robinson, the lead scientist for next year’s robotic mission. “That’s the coolest thing.”

Water, Water, Everywhere

Speculation about PSRs dates back to 1952, when the American chemist Harold Urey first hypothesized their existence on the moon. “Near its poles there may be depressions on which the sun never shines,” he wrote. He observed that, whereas Earth orbits the sun with its rotational axis tilted by 23.5 degrees, the moon orbits at a mere 1.5-degree tilt. This means the sun’s rays strike its poles nearly horizontally, and the rims of polar craters will block light from directly reaching their depths. However, Urey believed that any ice in these sunless locations would have been “rapidly lost” because of the moon’s lack of atmosphere.

Then in 1961, the geophysicist Kenneth Watson of Lawrence Berkeley National Laboratory theorized that ice could persist inside PSRs. Nightside temperatures on the moon were known to plunge to minus 150 degrees Celsius; Watson and two colleagues argued that this meant ice would get trapped in the coldest places, despite the exposure to space. “There should still be detectable amounts of ice in the permanently shaded areas of the moon,” they wrote.

Scientists debated the possibility of ice in PSRs until the early 1990s, when radar instruments detected signs of ice at the poles of Mercury, which was also thought to have permanently shadowed craters. In 1994, using a radar instrument on NASA’s Clementine spacecraft, scientists detected an enhanced signal over the moon’s south pole that was consistent with the presence of water ice. The hunt was on.

In 1999, Jean-Luc Margot at Cornell University and colleagues pinpointed PSRs on the moon that could contain ice. They used a radar dish in the Mojave Desert in California to make topographic maps of the lunar poles. “We simulated the direction of sunlight and used our topographic maps to identify regions that were permanently shadowed,” Margot said.

They located just a handful of PSRs, but subsequent studies have identified thousands. The largest measure tens of kilometers across inside giant craters, such as Shackleton crater at the lunar south pole, which is twice as deep as the Grand Canyon. The smallest span mere centimeters. At the Lunar and Planetary Science Conference held in Houston in March, Caitlin Ahrens, a planetary scientist at NASA’s Goddard Space Flight Center, presented research suggesting that some PSRs may grow and shrink slightly as temperatures on the moon fluctuate. “These are very dynamic cold regions,” Ahrens said in an interview. “They are not stagnant.”

New research indicates that some craters also contain double-shadowed regions, or “shadows within shadows,” said Patrick O’Brien, a graduate student at the University of Arizona, who presented evidence for the idea in Houston. While PSRs don’t experience direct sunlight, most receive some reflected light bouncing off the crater’s rim, and this can melt ice. Double-shadowed regions are secondary craters inside PSRs that don’t get reflected light. “Temperatures can be even colder than the permanent shadows,” said O’Brien; they reach as low as minus 250 degrees Celsius.

Icy Secrets

The double-shadowed regions are cold enough to freeze more exotic ices, like carbon dioxide and nitrogen, should any exist there. Scientists say the chemical composition of these and of the water ice inside PSRs could reveal how water got to the moon — and, more importantly, to Earth, and to rocky worlds in general. “Water is essential to life as we know it,” said Margaret Landis, a planetary scientist at the University of Colorado, Boulder. The question is, she said, “When and how did the conditions favorable for life on Earth form?” Whereas Earth’s past has been scrambled by geological processes, the moon is a museum of the solar system’s history; its ice is thought to have remained mostly untouched since its arrival.

There are three predominant theories about how water got to the moon. The first is that it arrived via asteroid or comet impacts. In this scenario, when the solar system formed, water molecules in the hot inner solar system were vaporized and blown away by the solar wind; only water in the frigid outskirts could condense and accumulate into icy bodies. These bodies subsequently bombarded the inner solar system, including the moon, delivering water. The second theory is that volcanic eruptions on the moon sometime in its middle age formed a thin, temporary lunar atmosphere that engendered ice formation at the poles. Or solar wind could have transported hydrogen to the moon that mixed with oxygen to form ice.

In February, a re-analysis of the LCROSS plume published in Nature Communications indicated that the ice in Cabeus crater is most likely of cometary origin. Analyzing the amount of nitrogen, sulfur and carbon frozen into the ice along with water, Kathleen Mandt of the Johns Hopkins University Applied Physics Laboratory and colleagues found that “the best explanation was comets,” said Mandt. “The nitrogen-to-carbon ratio was way beyond what was reasonable for volcanoes to have delivered.”

If the moon’s ice was delivered exclusively by comets, the same might have been true for Earth. That could mean rocky worlds must experience such impacts to accumulate the water necessary for life to flourish. However, Landis says it’s too early to say whether Mandt’s research holds true for all ice on the moon. “The community needs more time to digest it,” she said.

If some lunar ice is determined to be of volcanic origin, this would suggest worlds hold an innate ability to generate water from their interiors rather than relying on impacts. “It might be not all solar systems have lots of comets or asteroids,” said Landis, “but solar systems that form rocky planets might have this ability to have [volcanic] eruptions rear up water.”

Aside from looking for exotic ice in PSRs, scientists also want to measure the water ice’s proportion of deuterium, a heavier isotope of hydrogen. Substantial deuterium is more consistent with what’s found in comets (although rates vary), whereas less of it would point to solar wind. A volcanic origin would fall somewhere in the middle. Other elements will be informative, too; for instance, ice originating from volcanoes should contain abundant sulfur drawn up from the lunar interior, said Paul Hayne, a planetary scientist at the University of Colorado, Boulder.

Into the Abyss

No previous foray to the moon has ventured into its permanent shadows; the Apollo landings took place near the moon’s equator at a time when knowledge of PSRs was in its infancy. In 2019, China’s Chang’e-4 lander and rover touched down at the south pole, but it did not target PSRs.

In 2017, however, President Trump signed a directive to NASA to return humans to the moon, an initiative later named Artemis. Ahead of the first crewed Artemis landings in the mid-2020s, which may include the first sorties into the moon’s permanently shadowed craters, NASA is paying commercial companies to conduct initial robotic exploration.

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science”,”link”:”https://www.quantamagazine.org/tag/planetary-science/”},”$Post:114436.acf”:{“featured_block_title”:””,”kicker”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.kicker”,”typename”:”Term”},”featured_image_default”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.featured_image_default”,”typename”:”Image”},”featured_image_square”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.featured_image_square”,”typename”:”Image”},”featured_image_full_width”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.featured_image_full_width”,”typename”:”Image”},”featured_image_gif”:false,”featured_video”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_VIDEO_HP.mp4″,”full_page_interactive”:false,”podcast_publish_date”:””,”__typename”:”ACFFields”,”interactive_type”:null,”iframe_url”:null,”return_cursor”:null,”exclude_blurb”:null,”interactive_html”:null,”interactive_css”:null,”interactive_js”:null,”interactive_blurb”:null,”related_article”:null,”modules”:[{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.0″,”typename”:”ACFCode”},{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.1″,”typename”:”ACFContent”},{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.2″,”typename”:”ACFImageComponent”},{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.3″,”typename”:”ACFContent”},{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.4″,”typename”:”ACFCode”},{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.5″,”typename”:”ACFContent”},{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.6″,”typename”:”ACFImageComponent”},{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.7″,”typename”:”ACFContent”}],”template”:”article”,”subtitle”:”Robots are about to venture into the sunless depths of lunar craters to investigate ancient water ice trapped there, while remote studies find hints about how water arrives on rocky worlds.”,”title_layout”:”default”,”title_background_type”:null,”title_background_image”:null,”title_background_video”:null,”title_background_attribution”:null,”title_background_image_gif”:null,”title_overlay_enable”:null,”title_overlay_color”:null,”title_overlay_opacity”:null,”title_text_color”:null,”featured_image_attribution”:”\u003cp data-pm-slice=\”1 1 []\”>John Best/Simulation courtesy of the IDIA Lab at Ball State University\u003c/p>\n”,”featured_overlay_enable”:”false”,”featured_overlay_color”:null,”featured_overlay_opacity”:null,”series”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.series”,”typename”:”Term”},”intro_content”:null,”make_image_full_width”:null,”hide_ad_on_post”:false},”$Post:114436.acf.kicker”:{“name”:”planetary science”,”link”:”https://www.quantamagazine.org/tag/planetary-science/”,”__typename”:”Term”},”$Post:114436.acf.featured_image_default”:{“alt”:””,”caption”:””,”url”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_520x292.jpg”,”width”:520,”height”:292,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.featured_image_default.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.acf.featured_image_default.sizes”:{“thumbnail”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_520x292-520×292.jpg”,”square_small”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_520x292-160×160.jpg”,”square_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_520x292-520×292.jpg”,”medium”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_520x292.jpg”,”medium_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_520x292.jpg”,”large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_520x292.jpg”,”__typename”:”ImageSizes”},”$Post:114436.acf.featured_image_square”:{“alt”:””,”caption”:””,”url”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_300.jpg”,”width”:300,”height”:300,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.featured_image_square.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.acf.featured_image_square.sizes”:{“thumbnail”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_300.jpg”,”square_small”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_300-160×160.jpg”,”square_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_300.jpg”,”medium”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_300.jpg”,”medium_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_300.jpg”,”large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_300.jpg”,”__typename”:”ImageSizes”},”$Post:114436.acf.featured_image_full_width”:{“alt”:””,”caption”:””,”url”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_2880x1220_HP_Still.jpg”,”width”:2880,”height”:1220,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.featured_image_full_width.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.acf.featured_image_full_width.sizes”:{“thumbnail”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_2880x1220_HP_Still-520×220.jpg”,”square_small”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_2880x1220_HP_Still-160×160.jpg”,”square_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_2880x1220_HP_Still-520×520.jpg”,”medium”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_2880x1220_HP_Still-1720×729.jpg”,”medium_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_2880x1220_HP_Still-768×325.jpg”,”large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_2880x1220_HP_Still-2880×1220.jpg”,”__typename”:”ImageSizes”},”Term:189″:{“id”:”189″,”name”:”Physics”,”slug”:”physics”,”link”:”https://www.quantamagazine.org/physics/”,”__typename”:”Term”},”$Post:114436.authors.0.acf”:{“tagline”:”Contributing Writer”,”avatar”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.authors.0.acf.avatar”,”typename”:”Image”},”__typename”:”AuthorACF”},”$Post:114436.authors.0.acf.avatar”:{“alt”:”Jonathan O’Callaghan”,”caption”:”Jonathan O’Callaghan”,”url”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2021/01/OCallaghan_Jonathan.jpg”,”width”:1000,”height”:1000,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.authors.0.acf.avatar.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.authors.0.acf.avatar.sizes”:{“thumbnail”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2021/01/OCallaghan_Jonathan-520×520.jpg”,”square_small”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2021/01/OCallaghan_Jonathan-160×160.jpg”,”square_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2021/01/OCallaghan_Jonathan-520×520.jpg”,”medium”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2021/01/OCallaghan_Jonathan.jpg”,”medium_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2021/01/OCallaghan_Jonathan-768×768.jpg”,”large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2021/01/OCallaghan_Jonathan.jpg”,”__typename”:”ImageSizes”},”$Post:114436.acf.modules.0″:{“hide_this_component”:null,”acf_fc_layout”:”code”,”layout”:”large”,”code”:”\u003cvideo src=\”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_VIDEO_Lede.mp4\” autoplay=\”autoplay\” muted=\”true\” loop=\”true\” playsinline=\”true\” width=\”100%\” poster=\”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Shackleton_Crater_2880x1620_Lede_Still.jpg\”>\u003c/video>”,”caption”:”\u003cp>The interior of Shackleton crater, visible at the end of the video, never sees sunlight.\u003c/p>\n”,”attribution”:”\u003cp>John Best/Simulation courtesy of the IDIA Lab at Ball State University\u003c/p>\n”,”mobile_code”:””,”mobile_caption”:””,”mobile_attribution”:””,”fadein”:false,”large_margin”:false,”placeholder”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.0.placeholder”,”typename”:”Image”},”__typename”:”ACFCode”},”$Post:114436.acf.modules.0.placeholder”:{“alt”:null,”height”:null,”width”:null,”url”:null,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.0.placeholder.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.acf.modules.0.placeholder.sizes”:{“large”:null,”large_width”:null,”large_height”:null,”__typename”:”ImageSizes”},”$Post:114436.acf.modules.1″:{“hide_this_component”:null,”acf_fc_layout”:”content_area”,”show_sidebars”:true,”content”:”\u003cp>On October 9, 2009, a two-ton rocket smashed into the moon traveling at 9,000 kilometers per hour. As it exploded in a shower of dust and heated the lunar surface to hundreds of degrees, the jet-black crater into which it plummeted, called Cabeus, briefly filled with light for the first time in billions of years.\u003c/p>\n\u003cp>The crash was no accident. NASA’s Lunar Crater Observation and Sensing Satellite (LCROSS) mission aimed to see what would be kicked up from the lunar shadows by the impact. A spacecraft trailing the rocket flew through the dust plume to sample it, while NASA’s Lunar Reconnaissance Orbiter observed from afar. The results of the experiment were astonishing: Scientists \u003ca href=\”https://www.science.org/doi/10.1126/science.1186986\”>detected 155 kilograms of water vapor\u003c/a> mixed into the dust plume. They had, for the first time, found water on the moon. “It was absolutely definitive,” said \u003ca href=\”https://www.nasa.gov/centers/ames/research/2007/colaprete.html\”>Anthony Colaprete\u003c/a> of NASA’s Ames Research Center, the principal investigator of LCROSS.\u003c/p>\n\u003cp>The moon isn’t an obvious reservoir of water. “It’s really weird when you stop to think about it,” said \u003ca href=\”https://isearch.asu.edu/profile/957914\”>Mark Robinson\u003c/a>, a planetary scientist at Arizona State University. Its lack of atmosphere and extreme temperatures should cause any water to almost instantly evaporate. Yet about 25 years ago, spacecraft began to detect signatures of hydrogen around the moon’s poles, hinting that water might be trapped there as ice. LCROSS proved this theory. Scientists now think there’s not just a bit of water ice on the moon; there are 6 trillion kilograms of it.\u003c/p>\n\u003cp>Most of this ice resides in peculiar features at the moon’s poles called permanently shadowed regions (PSRs). These are craters like Cabeus into which the sun can’t reach, because of the geometry of the moon’s orbit. “They’re in permanent darkness,” said \u003ca href=\”https://www.mps.mpg.de/staff/59397\”>Valentin Bickel\u003c/a>, a planetary scientist at the Max Planck Institute for Solar System Research in Germany.\u003c/p>\n\u003cp>PSRs are of immense interest to scientists. Inside, temperatures can drop below minus 170 degrees Celsius. “Some PSRs are colder than the surface of Pluto,” said \u003ca href=\”https://www.parvathyprem.space/\”>Parvathy Prem\u003c/a>, a planetary scientist at the Johns Hopkins University Applied Physics Laboratory in Maryland. This means ice on or below the lunar surface in PSRs won’t necessarily melt; instead it might have survived there for billions of years. Studying the ice’s chemical composition should reveal how it was delivered to the moon, in turn illuminating the origin of water on Earth, or indeed any rocky world around any star. It could also be a resource for future human activities on the moon.\u003c/p>\n”,”fadein”:false,”__typename”:”ACFContent”},”$Post:114436.acf.modules.2″:{“hide_this_component”:null,”acf_fc_layout”:”image_component”,”layout”:”regular”,”settings”:””,”attribution”:”\u003cdiv>Lunar QuickMap\u003c/div>\n”,”caption”:”\u003cp>Thousands of permanently shadowed regions, shown in orange, lie in the vicinity of the moon’s north pole (left) and south pole.\u003c/p>\n”,”mobile_comp_caption”:””,”mobile_comp_attribution”:””,”sets”:[{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.2.sets.0″,”typename”:”ImageSet”}],”__typename”:”ACFImageComponent”},”$Post:114436.acf.modules.2.sets.0″:{“settings”:””,”image”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.2.sets.0.image”,”typename”:”Image”},”mobile_image”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.2.sets.0.mobile_image”,”typename”:”Image”},”mobile_side_margins”:false,”mobile_width_constraint”:””,”mobile_caption”:””,”mobile_attribution”:””,”zoom_image”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.2.sets.0.zoom_image”,”typename”:”Image”},”zoom_caption”:””,”zoom_attribution”:””,”mobile_zoom_image”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.2.sets.0.mobile_zoom_image”,”typename”:”Image”},”mobile_zoom_caption”:””,”mobile_zoom_attribution”:””,”external_link”:””,”__typename”:”ImageSet”},”$Post:114436.acf.modules.2.sets.0.image”:{“alt”:”Images of the moon’s north and south hemispheres overlaid with orange patches indicating the presence of permanently shadowed regions.”,”caption”:””,”url”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/water_poles-1.jpg”,”width”:2200,”height”:1100,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.2.sets.0.image.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.acf.modules.2.sets.0.image.sizes”:{“thumbnail”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/water_poles-1-520×260.jpg”,”square_small”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/water_poles-1-160×160.jpg”,”square_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/water_poles-1-520×520.jpg”,”medium”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/water_poles-1-1720×860.jpg”,”medium_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/water_poles-1-768×384.jpg”,”large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/water_poles-1.jpg”,”__typename”:”ImageSizes”},”$Post:114436.acf.modules.2.sets.0.mobile_image”:{“alt”:null,”caption”:null,”url”:null,”width”:null,”height”:null,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.2.sets.0.mobile_image.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.acf.modules.2.sets.0.mobile_image.sizes”:{“thumbnail”:null,”square_small”:null,”square_large”:null,”medium”:null,”medium_large”:null,”large”:null,”__typename”:”ImageSizes”},”$Post:114436.acf.modules.2.sets.0.zoom_image”:{“alt”:null,”caption”:null,”url”:null,”width”:null,”height”:null,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.2.sets.0.zoom_image.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.acf.modules.2.sets.0.zoom_image.sizes”:{“thumbnail”:null,”square_small”:null,”square_large”:null,”medium”:null,”medium_large”:null,”large”:null,”__typename”:”ImageSizes”},”$Post:114436.acf.modules.2.sets.0.mobile_zoom_image”:{“alt”:null,”caption”:null,”url”:null,”width”:null,”height”:null,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.2.sets.0.mobile_zoom_image.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.acf.modules.2.sets.0.mobile_zoom_image.sizes”:{“thumbnail”:null,”square_small”:null,”square_large”:null,”medium”:null,”medium_large”:null,”large”:null,”__typename”:”ImageSizes”},”$Post:114436.acf.modules.3″:{“hide_this_component”:null,”acf_fc_layout”:”content_area”,”show_sidebars”:false,”content”:”\u003cp>Studies so far have provided a tantalizing glimpse at best. But that’s about to change. Next year, robotic vehicles will enter the bewildering icy depths of PSRs for the first time, revealing what the interiors of these shadowed craters look like. By the decade’s end, NASA plans to send humans to explore in person.\u003c/p>\n\u003cp>On the eve of this new era of moon landings, a slew of fresh studies of PSRs have revealed that these shadowed regions are even stranger than scientists imagined. What will we find lurking in the shadows?\u003c/p>\n\u003cp>“I don’t know what we’re going to see,” said Robinson, the lead scientist for next year’s robotic mission. “That’s the coolest thing.”\u003c/p>\n\u003ch2>\u003cstrong>Water, Water, Everywhere\u003c/strong>\u003c/h2>\n\u003cp>Speculation about PSRs dates back to 1952, when the American chemist Harold Urey \u003ca href=\”https://agupubs.onlinelibrary.wiley.com/doi/full/10.1002/2016JE005167\”>first hypothesized their existence\u003c/a> on the moon. “Near its poles there may be depressions on which the sun never shines,” he wrote. He observed that, whereas Earth orbits the sun with its rotational axis tilted by 23.5 degrees, the moon orbits at a mere 1.5-degree tilt. This means the sun’s rays strike its poles nearly horizontally, and the rims of polar craters will block light from directly reaching their depths. However, Urey believed that any ice in these sunless locations would have been “rapidly lost” because of the moon’s lack of atmosphere.\u003c/p>\n\u003cdiv id=’component-626ac80d876e3′ class=””>\u003cscript type=\”text/template\”>{\”type\”:\”Image\”,\”id\”:\”component-626ac80d876e3\”,\”data\”:{\”id\”:114448,\”src\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/MoonCraters_Quanta_JOC.jpg\”,\”alt\”:\”Black-and-white photo of a man in glasses, a suit and tie fiddling with an experiment in a chemistry lab\”,\”class\”:\”\”,\”width\”:2000,\”height\”:1619,\”mobileSrc\”:false,\”zoomSrc\”:false,\”mobileZoomSrc\”:false,\”align\”:\”align=\\\”right\\\”\”,\”wrapper_width\”:\”\”,\”caption\”:\”\u003cp>The American chemist Harold Urey won the 1934 Nobel Prize in Chemistry for discovering deuterium. He also worked on the Manhattan Project and did pioneering research on the origin of life, paleoclimatology, and the origin and properties of the moon.\u003c\\/p>\\n\”,\”attribution\”:\”\u003cp>U.S. Department of Energy\u003c\\/p>\\n\”,\”variant\”:\”shortcode\”,\”size\”:\”wide\”,\”disableZoom\”:false,\”disableMobileZoom\”:false,\”srcImage\”:{\”ID\”:114448,\”id\”:114448,\”title\”:\”MoonCraters_Quanta_JOC\”,\”filename\”:\”MoonCraters_Quanta_JOC.jpg\”,\”filesize\”:762647,\”url\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/MoonCraters_Quanta_JOC.jpg\”,\”link\”:\”https:\\/\\/www.quantamagazine.org\\/secrets-of-the-moons-permanent-shadows-are-coming-to-light-20220428\\/mooncraters_quanta_joc\\/\”,\”alt\”:\”Black-and-white photo of a man in glasses, a suit and tie fiddling with an experiment in a chemistry lab\”,\”author\”:\”42689\”,\”description\”:\”\”,\”caption\”:\”\”,\”name\”:\”mooncraters_quanta_joc\”,\”status\”:\”inherit\”,\”uploaded_to\”:114436,\”date\”:\”2022-04-27 16:36:00\”,\”modified\”:\”2022-04-27 17:52:31\”,\”menu_order\”:0,\”mime_type\”:\”image\\/jpeg\”,\”type\”:\”image\”,\”subtype\”:\”jpeg\”,\”icon\”:\”https:\\/\\/api.quantamagazine.org\\/wp-includes\\/images\\/media\\/default.png\”,\”width\”:2000,\”height\”:1619,\”sizes\”:{\”thumbnail\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/MoonCraters_Quanta_JOC-520×421.jpg\”,\”thumbnail-width\”:520,\”thumbnail-height\”:421,\”medium\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/MoonCraters_Quanta_JOC-1720×1392.jpg\”,\”medium-width\”:1720,\”medium-height\”:1392,\”medium_large\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/MoonCraters_Quanta_JOC-768×622.jpg\”,\”medium_large-width\”:768,\”medium_large-height\”:622,\”large\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/MoonCraters_Quanta_JOC.jpg\”,\”large-width\”:2000,\”large-height\”:1619,\”square_small\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/MoonCraters_Quanta_JOC-160×160.jpg\”,\”square_small-width\”:160,\”square_small-height\”:160,\”square_large\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/MoonCraters_Quanta_JOC-520×520.jpg\”,\”square_large-width\”:520,\”square_large-height\”:520}},\”largeForPrint\”:true,\”externalLink\”:\”\”,\”original_resolution\”:false}}\u003c\/script>\u003c/div>\n\u003cp>Then in 1961, the geophysicist Kenneth Watson of Lawrence Berkeley National Laboratory \u003ca href=\”https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/JZ066i009p03033\”>theorized\u003c/a> that ice could persist inside PSRs. Nightside temperatures on the moon were known to plunge to minus 150 degrees Celsius; Watson and two colleagues argued that this meant ice would get trapped in the coldest places, despite the exposure to space. “There should still be detectable amounts of ice in the permanently shaded areas of the moon,” they wrote.\u003c/p>\n\u003cp>Scientists debated the possibility of ice in PSRs until the early 1990s, when radar instruments detected \u003ca href=\”https://www.nrao.edu/pr/2000/vla20/background/mercuryice/\”>signs of ice at the poles of Mercury\u003c/a>, which was also thought to have permanently shadowed craters. In 1994, using a radar instrument on NASA’s Clementine spacecraft, scientists \u003ca href=\”https://www.science.org/doi/10.1126/science.274.5292.1495\”>detected an enhanced signal\u003c/a> over the moon’s south pole that was consistent with the presence of water ice. The hunt was on.\u003c/p>\n\u003cp>In 1999, Jean-Luc Margot at Cornell University and colleagues \u003ca href=\”https://www.science.org/doi/10.1126/science.284.5420.1658\”>pinpointed PSRs\u003c/a> on the moon that could contain ice. They used a radar dish in the Mojave Desert in California to make topographic maps of the lunar poles. “We simulated the direction of sunlight and used our topographic maps to identify regions that were permanently shadowed,” Margot said.\u003c/p>\n\u003cp>They located just a handful of PSRs, but subsequent studies have identified thousands. The largest measure \u003ca href=\”http://lroc.sese.asu.edu/psr/list\”>tens of kilometers across\u003c/a> inside giant craters, such as Shackleton crater at the lunar south pole, which is twice as deep as the Grand Canyon. The smallest span mere centimeters. At the Lunar and Planetary Science Conference held in Houston in March, \u003ca href=\”https://science.gsfc.nasa.gov/sed/bio/caitlin.ahrens\”>Caitlin Ahrens\u003c/a>, a planetary scientist at NASA’s Goddard Space Flight Center, presented research suggesting that some PSRs may \u003ca href=\”https://www.hou.usra.edu/meetings/lpsc2022/pdf/2339.pdf\”>grow and shrink\u003c/a> slightly as temperatures on the moon fluctuate. “These are very dynamic cold regions,” Ahrens said in an interview. “They are not stagnant.”\u003c/p>\n\u003cdiv id=’component-626ac80d8ba71′ class=””>\u003cscript type=\”text/template\”>{\”type\”:\”Image\”,\”id\”:\”component-626ac80d8ba71\”,\”data\”:{\”id\”:114479,\”src\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/obrien.jpg\”,\”alt\”:\”\”,\”class\”:\”\”,\”width\”:1000,\”height\”:1410,\”mobileSrc\”:false,\”zoomSrc\”:false,\”mobileZoomSrc\”:false,\”align\”:\”align=\\\”right\\\”\”,\”wrapper_width\”:\”\”,\”caption\”:\”\u003cp>Patrick O’Brien and a colleague recently identified double-shadowed regions on the moon that are cold enough to keep exotic ices frozen.\u003c\\/p>\\n\”,\”attribution\”:\”\u003cp>Courtesy of Patrick O’Brien\u003c\\/p>\\n\”,\”variant\”:\”shortcode\”,\”size\”:\”default\”,\”disableZoom\”:false,\”disableMobileZoom\”:false,\”srcImage\”:{\”ID\”:114479,\”id\”:114479,\”title\”:\”obrien\”,\”filename\”:\”obrien.jpg\”,\”filesize\”:328648,\”url\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/obrien.jpg\”,\”link\”:\”https:\\/\\/www.quantamagazine.org\\/secrets-of-the-moons-permanent-shadows-are-coming-to-light-20220428\\/obrien\\/\”,\”alt\”:\”\”,\”author\”:\”42689\”,\”description\”:\”\”,\”caption\”:\”\”,\”name\”:\”obrien\”,\”status\”:\”inherit\”,\”uploaded_to\”:114436,\”date\”:\”2022-04-27 20:44:51\”,\”modified\”:\”2022-04-27 20:44:51\”,\”menu_order\”:0,\”mime_type\”:\”image\\/jpeg\”,\”type\”:\”image\”,\”subtype\”:\”jpeg\”,\”icon\”:\”https:\\/\\/api.quantamagazine.org\\/wp-includes\\/images\\/media\\/default.png\”,\”width\”:1000,\”height\”:1410,\”sizes\”:{\”thumbnail\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/obrien-369×520.jpg\”,\”thumbnail-width\”:369,\”thumbnail-height\”:520,\”medium\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/obrien.jpg\”,\”medium-width\”:1000,\”medium-height\”:1410,\”medium_large\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/obrien-768×1083.jpg\”,\”medium_large-width\”:768,\”medium_large-height\”:1083,\”large\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/obrien.jpg\”,\”large-width\”:1000,\”large-height\”:1410,\”square_small\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/obrien-160×160.jpg\”,\”square_small-width\”:160,\”square_small-height\”:160,\”square_large\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/obrien-520×520.jpg\”,\”square_large-width\”:520,\”square_large-height\”:520}},\”largeForPrint\”:false,\”externalLink\”:\”\”,\”original_resolution\”:false}}\u003c\/script>\u003c/div>\n\u003cp>New research indicates that some craters also contain \u003ca href=\”https://www.hou.usra.edu/meetings/lpsc2022/pdf/2372.pdf\”>double-shadowed regions\u003c/a>, or “shadows within shadows,” said Patrick O’Brien, a graduate student at the University of Arizona, who presented evidence for the idea in Houston. While PSRs don’t experience direct sunlight, most receive some reflected light bouncing off the crater’s rim, and this can melt ice. Double-shadowed regions are secondary craters inside PSRs that don’t get reflected light. “Temperatures can be even colder than the permanent shadows,” said O’Brien; they reach as low as minus 250 degrees Celsius.\u003c/p>\n\u003ch2>\u003cstrong>Icy Secrets\u003c/strong>\u003c/h2>\n\u003cp>The double-shadowed regions are cold enough to freeze more exotic ices, like carbon dioxide and nitrogen, should any exist there. Scientists say the chemical composition of these and of the water ice inside PSRs could reveal how water got to the moon — and, more importantly, to Earth, and to rocky worlds in general. “Water is essential to life as we know it,” said \u003ca href=\”https://experts.colorado.edu/display/fisid_165700\”>Margaret Landis\u003c/a>, a planetary scientist at the University of Colorado, Boulder. The question is, she said, “When and how did the conditions favorable for life on Earth form?” Whereas Earth’s past has been scrambled by geological processes, the moon is a museum of the solar system’s history; its ice is thought to have remained mostly untouched since its arrival.\u003c/p>\n\u003cp>There are three predominant theories about how water got to the moon. The first is that it arrived via asteroid or comet impacts. In this scenario, when the solar system formed, water molecules in the hot inner solar system were vaporized and blown away by the solar wind; only water in the frigid outskirts could condense and accumulate into icy bodies. These bodies subsequently bombarded the inner solar system, including the moon, delivering water. The second theory is that volcanic eruptions on the moon sometime in its middle age formed a thin, temporary lunar atmosphere that engendered ice formation at the poles. Or solar wind could have transported hydrogen to the moon that mixed with oxygen to form ice.\u003c/p>\n\u003cp>In February, \u003ca href=\”https://www.nature.com/articles/s41467-022-28289-6\”>a re-analysis of the LCROSS plume\u003c/a> published in \u003cem>Nature Communications\u003c/em> indicated that the ice in Cabeus crater is most likely of cometary origin. Analyzing the amount of nitrogen, sulfur and carbon frozen into the ice along with water, \u003ca href=\”https://civspace.jhuapl.edu/people/kathleen-mandt\”>Kathleen Mandt\u003c/a> of the Johns Hopkins University Applied Physics Laboratory and colleagues found that “the best explanation was comets,” said Mandt. “The nitrogen-to-carbon ratio was way beyond what was reasonable for volcanoes to have delivered.”\u003c/p>\n\u003cp>If the moon’s ice was delivered exclusively by comets, the same might have been true for Earth. That could mean rocky worlds must experience such impacts to accumulate the water necessary for life to flourish. However, Landis says it’s too early to say whether Mandt’s research holds true for all ice on the moon. “The community needs more time to digest it,” she said.\u003c/p>\n\u003cdiv id=’component-626ac80d8fadf’ class=””>\u003cscript type=\”text/template\”>{\”type\”:\”Image\”,\”id\”:\”component-626ac80d8fadf\”,\”data\”:{\”id\”:114449,\”src\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/Kathleen_Mandt.jpg\”,\”alt\”:\”A woman with dark hair and glasses stands in a field smiling at the camera.\”,\”class\”:\”\”,\”width\”:2000,\”height\”:1790,\”mobileSrc\”:false,\”zoomSrc\”:false,\”mobileZoomSrc\”:false,\”align\”:\”align=\\\”right\\\”\”,\”wrapper_width\”:\”\”,\”caption\”:\”\u003cp>The planetary scientist Kathleen Mandt\\u2019s recent study of water vapor kicked up from a lunar crater suggests that a comet delivered the water to the moon.\u003c\\/p>\\n\”,\”attribution\”:\”\u003cp>Elsa Mandt\u003c\\/p>\\n\”,\”variant\”:\”shortcode\”,\”size\”:\”wide\”,\”disableZoom\”:true,\”disableMobileZoom\”:false,\”srcImage\”:{\”ID\”:114449,\”id\”:114449,\”title\”:\”Kathleen_Mandt\”,\”filename\”:\”Kathleen_Mandt.jpg\”,\”filesize\”:400008,\”url\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/Kathleen_Mandt.jpg\”,\”link\”:\”https:\\/\\/www.quantamagazine.org\\/secrets-of-the-moons-permanent-shadows-are-coming-to-light-20220428\\/kathleen_mandt\\/\”,\”alt\”:\”A woman with dark hair and glasses stands in a field smiling at the camera.\”,\”author\”:\”42689\”,\”description\”:\”\”,\”caption\”:\”\”,\”name\”:\”kathleen_mandt\”,\”status\”:\”inherit\”,\”uploaded_to\”:114436,\”date\”:\”2022-04-27 16:36:01\”,\”modified\”:\”2022-04-27 17:52:31\”,\”menu_order\”:0,\”mime_type\”:\”image\\/jpeg\”,\”type\”:\”image\”,\”subtype\”:\”jpeg\”,\”icon\”:\”https:\\/\\/api.quantamagazine.org\\/wp-includes\\/images\\/media\\/default.png\”,\”width\”:2000,\”height\”:1790,\”sizes\”:{\”thumbnail\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/Kathleen_Mandt-520×465.jpg\”,\”thumbnail-width\”:520,\”thumbnail-height\”:465,\”medium\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/Kathleen_Mandt-1720×1539.jpg\”,\”medium-width\”:1720,\”medium-height\”:1539,\”medium_large\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/Kathleen_Mandt-768×687.jpg\”,\”medium_large-width\”:768,\”medium_large-height\”:687,\”large\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/Kathleen_Mandt.jpg\”,\”large-width\”:2000,\”large-height\”:1790,\”square_small\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/Kathleen_Mandt-160×160.jpg\”,\”square_small-width\”:160,\”square_small-height\”:160,\”square_large\”:\”https:\\/\\/d2r55xnwy6nx47.cloudfront.net\\/uploads\\/2022\\/04\\/Kathleen_Mandt-520×520.jpg\”,\”square_large-width\”:520,\”square_large-height\”:520}},\”largeForPrint\”:false,\”externalLink\”:\”\”,\”original_resolution\”:false}}\u003c\/script>\u003c/div>\n\u003cp>If some lunar ice is determined to be of volcanic origin, this would suggest worlds hold an innate ability to generate water from their interiors rather than relying on impacts. “It might be not all solar systems have lots of comets or asteroids,” said Landis, “but solar systems that form rocky planets might have this ability to have [volcanic] eruptions rear up water.”\u003c/p>\n\u003cp>Aside from looking for exotic ice in PSRs, scientists also want to measure the water ice’s proportion of deuterium, a heavier isotope of hydrogen. Substantial deuterium is more consistent with what’s found in comets (although rates vary), whereas less of it would point to solar wind. A volcanic origin would fall somewhere in the middle. Other elements will be informative, too; for instance, ice originating from volcanoes should contain abundant sulfur drawn up from the lunar interior, said \u003ca href=\”https://www.colorado.edu/aps/paul-hayne\”>Paul Hayne\u003c/a>, a planetary scientist at the University of Colorado, Boulder.\u003c/p>\n\u003ch2>\u003cstrong>Into the Abyss\u003c/strong>\u003c/h2>\n\u003cp>No previous foray to the moon has ventured into its permanent shadows; the Apollo landings took place near the moon’s equator at a time when knowledge of PSRs was in its infancy. In 2019, China’s Chang’e-4 lander and rover touched down at the south pole, but it did not target PSRs.\u003c/p>\n\u003cp>In 2017, however, President Trump \u003ca href=\”https://www.nasa.gov/press-release/new-space-policy-directive-calls-for-human-expansion-across-solar-system/\”>signed a directive to NASA\u003c/a> to return humans to the moon, an initiative later named Artemis. Ahead of the first crewed Artemis landings in the mid-2020s, which may include the first sorties into the moon’s permanently shadowed craters, NASA is \u003ca href=\”https://www.nasa.gov/feature/nasa-asks-commercial-partners-to-land-water-measuring-drill-on-moon\”>paying commercial companies\u003c/a> to conduct initial robotic exploration.\u003c/p>\n”,”fadein”:false,”__typename”:”ACFContent”},”$Post:114436.acf.modules.4″:{“hide_this_component”:null,”acf_fc_layout”:”code”,”layout”:”inline”,”code”:”\u003cvideo src=\”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/desktop-1.mp4\” autoplay=\”autoplay\” muted=\”true\” loop=\”true\” playsinline=\”true\” width=\”100%\” \u003c/video>”,”caption”:null,”attribution”:”\u003cp>Merrill Sherman/Quanta Magazine; Source: NASA\u003c/p>\n”,”mobile_code”:””,”mobile_caption”:””,”mobile_attribution”:””,”fadein”:false,”large_margin”:false,”placeholder”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.4.placeholder”,”typename”:”Image”},”__typename”:”ACFCode”},”$Post:114436.acf.modules.4.placeholder”:{“alt”:null,”height”:null,”width”:null,”url”:null,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.4.placeholder.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.acf.modules.4.placeholder.sizes”:{“large”:null,”large_width”:null,”large_height”:null,”__typename”:”ImageSizes”},”$Post:114436.acf.modules.5″:{“hide_this_component”:null,”acf_fc_layout”:”content_area”,”show_sidebars”:false,”content”:”\u003cp>Houston-based Intuitive Machines will be the first of these companies to explore a PSR, albeit briefly. Their Nova-C lander, scheduled to launch by the end of this year on a SpaceX rocket, will touch down on a ridge near Shackleton crater, a possible target for subsequent human exploration. The lander will then deploy a suitcase-size vehicle called the Micro-Nova Hopper. Intuitive Machines \u003ca href=\”https://www.hou.usra.edu/meetings/lpsc2022/pdf/2007.pdf\”>revealed details of the excursion\u003c/a> at the Lunar and Planetary Science Conference: The Hopper will use thrusters to jump across the lunar surface, up to hundreds of meters at a time; in three hops, it will reach the edge of the 100-meter-wide Marston crater, which contains a PSR. Then the Hopper will fire itself above Marston and descend into the pitch-black depths.\u003c/p>\n\u003cp>The lander has cameras and lights, but it’s unclear what it will see. Sheets of surface ice are possible, said Robinson, the mission’s lead scientist, but he says it’s more likely that the vehicle’s lights will reflect off ice crystals mixed in with the lunar soil. Or if there’s minimal ice on the surface, it may not definitively show up in images at all. Whatever the case, the view will be historic.\u003c/p>\n\u003cp>The Hopper’s dip into Marston will last no more than 45 minutes, and the scientific return will be limited — the primary goal is simply to demonstrate that the hopping approach works. But we won’t have long to wait for a more thorough dive into the lunar abyss.\u003c/p>\n\u003ch2>\u003cstrong>Drilling Down\u003c/strong>\u003c/h2>\n\u003cp>This summer, the inaugural launch of NASA’s new Space Launch System rocket (which will propel Artemis missions to the moon) will carry \u003ca href=\”https://spacecenter.org/artemis-i-about-the-payload/\”>several small spacecraft\u003c/a> that will study PSRs from lunar orbit. A Korean orbiter launching in August, meanwhile, will carry \u003ca href=\”https://www.hou.usra.edu/meetings/lpsc2022/pdf/1659.pdf\”>ShadowCam\u003c/a>, a purpose-built NASA instrument designed to image PSRs.\u003c/p>\n\u003cp>The defining moment in robotic PSR exploration, however, will come in late 2023, when a golf cart-size rover called VIPER (Volatiles Investigating Polar Exploration Rover) will head to the moon on a SpaceX Falcon Heavy rocket. Upon exiting its landing vehicle, VIPER will drive into three of the moon’s permanently shadowed regions and drill into the ground.\u003c/p>\n\u003cp>Operating for up to 10 hours at a time before exiting to recharge its solar-powered batteries, the rover will drill up to a meter deep for subsurface ice, or dig into any exposed ice on the surface. “If there’s a block of ice we’re going to know right away, because of how hard it is to get through,” said Kris Zacny of Honeybee Robotics in Colorado, which designed the drill. The team expects to perform up to 50 drilling sessions.\u003c/p>\n”,”fadein”:false,”__typename”:”ACFContent”},”$Post:114436.acf.modules.6″:{“hide_this_component”:null,”acf_fc_layout”:”image_component”,”layout”:”inline”,”settings”:””,”attribution”:”\u003cp>NASA / Bridget Caswell, Alcyon Technical Services\u003c/p>\n”,”caption”:”\u003cp>Engineers tested a model of the VIPER rover at NASA’s Glenn Research Center in Cleveland, Ohio, in 2020.\u003c/p>\n”,”mobile_comp_caption”:””,”mobile_comp_attribution”:””,”sets”:[{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.6.sets.0″,”typename”:”ImageSet”}],”__typename”:”ACFImageComponent”},”$Post:114436.acf.modules.6.sets.0″:{“settings”:””,”image”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.6.sets.0.image”,”typename”:”Image”},”mobile_image”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.6.sets.0.mobile_image”,”typename”:”Image”},”mobile_side_margins”:false,”mobile_width_constraint”:””,”mobile_caption”:””,”mobile_attribution”:””,”zoom_image”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.6.sets.0.zoom_image”,”typename”:”Image”},”zoom_caption”:””,”zoom_attribution”:””,”mobile_zoom_image”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.6.sets.0.mobile_zoom_image”,”typename”:”Image”},”mobile_zoom_caption”:””,”mobile_zoom_attribution”:””,”external_link”:””,”__typename”:”ImageSet”},”$Post:114436.acf.modules.6.sets.0.image”:{“alt”:”A buggy climbs a sandy incline in a lab while two engineers in shields look on.”,”caption”:””,”url”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Rover.jpg”,”width”:1220,”height”:1169,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.6.sets.0.image.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.acf.modules.6.sets.0.image.sizes”:{“thumbnail”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Rover-520×498.jpg”,”square_small”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Rover-160×160.jpg”,”square_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Rover-520×520.jpg”,”medium”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Rover.jpg”,”medium_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Rover-768×736.jpg”,”large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Rover.jpg”,”__typename”:”ImageSizes”},”$Post:114436.acf.modules.6.sets.0.mobile_image”:{“alt”:null,”caption”:null,”url”:null,”width”:null,”height”:null,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.6.sets.0.mobile_image.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.acf.modules.6.sets.0.mobile_image.sizes”:{“thumbnail”:null,”square_small”:null,”square_large”:null,”medium”:null,”medium_large”:null,”large”:null,”__typename”:”ImageSizes”},”$Post:114436.acf.modules.6.sets.0.zoom_image”:{“alt”:null,”caption”:null,”url”:null,”width”:null,”height”:null,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.6.sets.0.zoom_image.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.acf.modules.6.sets.0.zoom_image.sizes”:{“thumbnail”:null,”square_small”:null,”square_large”:null,”medium”:null,”medium_large”:null,”large”:null,”__typename”:”ImageSizes”},”$Post:114436.acf.modules.6.sets.0.mobile_zoom_image”:{“alt”:null,”caption”:null,”url”:null,”width”:null,”height”:null,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.acf.modules.6.sets.0.mobile_zoom_image.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.acf.modules.6.sets.0.mobile_zoom_image.sizes”:{“thumbnail”:null,”square_small”:null,”square_large”:null,”medium”:null,”medium_large”:null,”large”:null,”__typename”:”ImageSizes”},”$Post:114436.acf.modules.7″:{“hide_this_component”:null,”acf_fc_layout”:”content_area”,”show_sidebars”:false,”content”:”\u003cp>VIPER will “revolutionize” our knowledge of these regions, said Landis. It will \u003ca href=\”https://www.nasa.gov/viper/rover\”>use spectrometers\u003c/a> to analyze any ice that’s found, revealing the ratio of deuterium to hydrogen and looking for hints of carbon dioxide or nitrogen. VIPER may provide conclusive insight into where the moon’s ice comes from, and the general conditions under which ice might be found on rocky bodies. “We will have a quantum leap in our understanding,” said Colaprete, VIPER’s project scientist.\u003c/p>\n\u003ch2>\u003cstrong>Drops to Drink\u003c/strong>\u003c/h2>\n\u003cp>The scientific advances will come on the coattails of a different project. If ice is accessible on or near the surface in PSRs, NASA hopes that astronauts could use it as either drinking water or fuel. NASA is currently planning for the first crewed Artemis landing in 2025 to touch down near a PSR so that the astronauts can see for themselves how viable such an idea might be.\u003c/p>\n\u003cp>“This is not the Apollo program; we’re planning to stay there for a whole month,” said Jim Green, NASA’s former chief scientist. He added, “The concept of acquiring materials and having habitats on the moon is viable.”\u003c/p>\n\u003cdiv id=’component-626ac80d9660d’ class=”related-list”>\u003cscript type=\”text/template\”>{\”type\”:\”LinkList\”,\”id\”:\”component-626ac80d9660d\”,\”data\”:{\”title\”:\”Related:\”,\”class\”:\”related-list\”,\”links\”:[{\”type\”:\”internal\”,\”link\”:\”https:\\/\\/www.quantamagazine.org\\/what-made-the-moon-new-ideas-try-to-rescue-a-troubled-theory-20170802\\/\”,\”title\”:\”What Made the Moon? New Ideas Try to Rescue a Troubled Theory\”},{\”type\”:\”internal\”,\”link\”:\”https:\\/\\/www.quantamagazine.org\\/the-sun-was-dimmer-when-earth-formed-how-did-life-emerge-20220127\\/\”,\”title\”:\”A Solution to the Faint-Sun Paradox Reveals a Narrow Window for Life\”},{\”type\”:\”internal\”,\”link\”:\”https:\\/\\/www.quantamagazine.org\\/black-hot-superionic-ice-may-be-natures-most-common-form-of-water-20190508\\/\”,\”title\”:\”Black, Hot Ice May Be Nature\\u2019s Most Common Form of Water\”}]}}\u003c\/script>\u003c/div>\n\u003cp>Various proposals for how to extract and utilize water ice are under development, said Kevin Cannon, a space resource expert at Colorado School of Mines. “People are looking at mechanical systems like diggers, backhoes and excavators,” he said. Concentrated sunlight or an oven would then be used to \u003ca href=\”https://arc.aiaa.org/doi/abs/10.2514/6.2020-4236\”>extract the water\u003c/a> from the excavated lunar soil. Another idea is to “skip the excavation step and just directly heat the ground in some kind of tent,” Cannon said.\u003c/p>\n\u003cp>Confirmation that there is indeed accessible ice on the moon could come by the start of next year, with the first images from inside a permanently shadowed lunar crater. By the end of 2023 we may know for sure how it got there.\u003c/p>\n\u003cp>“There are so many fundamental things we don’t yet understand,” said Prem. “We really are at the beginning.”\u003c/p>\n”,”fadein”:false,”__typename”:”ACFContent”},”$Post:114436.acf.series”:{“name”:null,”link”:null,”__typename”:”Term”},”$Post:114436.next.data.0″:{“title”:”What Happens When We Give Animals Our Diseases?”,”link”:”https://www.quantamagazine.org/what-happens-when-we-give-animals-our-diseases-20220427/”,”categories”:[{“type”:”id”,”generated”:true,”id”:”$Post:114436.next.data.0.categories.0″,”typename”:”Term”}],”featured_media_image”:null,”acf”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.next.data.0.acf”,”typename”:”ACFFields”},”__typename”:”Post”},”$Post:114436.next.data.0.categories.0″:{“slug”:”biology”,”__typename”:”Term”},”$Post:114436.next.data.0.acf”:{“template”:”article”,”featured_block_title”:””,”featured_image_gif”:false,”featured_image_default”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.next.data.0.acf.featured_image_default”,”typename”:”Image”},”featured_image_full_width”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.next.data.0.acf.featured_image_full_width”,”typename”:”Image”},”__typename”:”ACFFields”},”$Post:114436.next.data.0.acf.featured_image_default”:{“alt”:”Illustration of a red human figured amid blue silhouettes of animals, in front of a red background.”,”caption”:””,”url”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Spillback_520x292.jpg”,”width”:520,”height”:292,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.next.data.0.acf.featured_image_default.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.next.data.0.acf.featured_image_default.sizes”:{“thumbnail”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Spillback_520x292-520×292.jpg”,”square_small”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Spillback_520x292-160×160.jpg”,”square_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Spillback_520x292-520×292.jpg”,”medium”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Spillback_520x292.jpg”,”medium_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Spillback_520x292.jpg”,”large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Spillback_520x292.jpg”,”__typename”:”ImageSizes”},”$Post:114436.next.data.0.acf.featured_image_full_width”:{“alt”:”Illustration of a red human figured amid blue silhouettes of animals, in front of a red background.”,”caption”:””,”url”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Spillback_2560_HPA.jpg”,”width”:2560,”height”:1084,”sizes”:{“type”:”id”,”generated”:true,”id”:”$Post:114436.next.data.0.acf.featured_image_full_width.sizes”,”typename”:”ImageSizes”},”__typename”:”Image”},”$Post:114436.next.data.0.acf.featured_image_full_width.sizes”:{“thumbnail”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Spillback_2560_HPA-520×220.jpg”,”square_small”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Spillback_2560_HPA-160×160.jpg”,”square_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Spillback_2560_HPA-520×520.jpg”,”medium”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Spillback_2560_HPA-1720×728.jpg”,”medium_large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Spillback_2560_HPA-768×325.jpg”,”large”:”https://d2r55xnwy6nx47.cloudfront.net/uploads/2022/04/Spillback_2560_HPA.jpg”,”__typename”:”ImageSizes”},”$Post:114436.next”:{“data”:[{“type”:”id”,”generated”:true,”id”:”$Post:114436.next.data.0″,”typename”:”Post”}],”__typename”:”PostPageArchive”}}\r\n\n\n”,”settings”:{“socialLinks”:[{“type”:”facebook”,”label”:”Facebook”,”url”:”https://www.facebook.com/QuantaNews”,”__typename”:”SocialMediaLink”},{“type”:”twitter”,”label”:”Twitter”,”url”:”https://twitter.com/QuantaMagazine”,”__typename”:”SocialMediaLink”},{“type”:”youtube”,”label”:”YouTube”,”url”:”https://www.youtube.com/c/QuantaScienceChannel”,”__typename”:”SocialMediaLink”},{“type”:”instagram”,”label”:”Instagram”,”url”:”https://instagram.com/quantamag”,”__typename”:”SocialMediaLink”},{“type”:”rss”,”label”:”RSS”,”url”:”https://api.quantamagazine.org/feed/”,”__typename”:”SocialMediaLink”}],”newsletterAction”:”https://quantamagazine.us1.list-manage.com/subscribe/post?u=0d6ddf7dc1a0b7297c8e06618&id=f0cb61321c”,”newsletterUrl”:”http://us1.campaign-archive2.com/home/?u=0d6ddf7dc1a0b7297c8e06618&id=f0cb61321c”,”sfNotice”:”An editorially independent publication supported by the Simons Foundation.”,”commentsHeader”:”

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