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Before-and-after views from the Lunar Reconnaissance Orbiter Camera (LROC<\/a>) capture fresh impact sites surrounded by faint, far-reaching dark rays that extend tens of miles across the surface.<\/p>\n By tracing those patterns, Emerson Speyerer and colleagues at Arizona State University (ASU<\/a>) documented how each new crater leaves a broad zone of subtle disturbance rather than a sharply bounded scar.<\/p>\n Across six recent impact sites, including one about 230 feet (70 meters) wide, the disturbed regions stretched far past the visible debris fields mapped in earlier work.\u00a0<\/p>\n That mismatch between visible ejecta and the full extent of surface change shows that impacts reshape far more terrain than standard crater measurements alone would suggest.<\/p>\n Lunar dust color<\/p>\n Lunar impacts do more than dig holes. They churn up the Moon\u2019s surface<\/a>, disturbing layers of loose soil and broken rock known as regolith.<\/p>\n Over time, that exposed material does not stay the same. Sunlight, charged particles from the Sun, and constant micrometeorite strikes slowly wear it down in a process called space weathering.<\/p>\n As this process continues, weathered grains grow nanophase iron \u2013 tiny iron specks \u2013 and glassy clumps that make older soil darker and redder.<\/p>\n Fresh impacts reset that aging record by lifting cleaner grains and burying others before they age in place again.<\/p>\n Rays travel farther<\/p>\n Far from the rim, some new craters made dark rays that stretched far beyond maps of ejecta, thrown-out crater debris, even without thick blankets.<\/p>\n Earlier temporal imaging<\/a>, before-and-after pictures of the same ground, had already found 222 new craters and faster soil overturn.<\/p>\n A March 17, 2013, impact<\/a> had already shown thrown debris making small pits around a new 62-foot (19-meter) crater.<\/p>\n New 230-foot (70-meter) crater rays now extend that pattern beyond 1,000 crater diameters, exposing a wider disturbance zone.<\/p>\n Color marks limits<\/p>\n Color measurements narrowed the cause because distant dark<\/a> zones did not turn bluer, redder, or visibly different.<\/p>\n A real coating of new material would have changed the spectral slope, how brightness varies across colors.<\/p>\n For the 230-foot (70-meter) crater, a thin layer would require 375 times more material than the crater excavated.<\/p>\n That mismatch points to scattered particles roughening the surface instead of painting it with fresh dust.<\/p>\n Angles expose roughness<\/p>\n Viewing angle revealed the dark rays because they looked stronger when sunlight struck and reflected obliquely during orbital observations.<\/p>\n Researchers tested that behavior with phase angle, the Sun-surface-camera angle, which changes how shadows appear.<\/p>\n Low-phase views could hide the marks, while higher-phase views made roughened dust stand out against calmer ground.<\/p>\n This contrast identified photometric roughness, or light-sensitive surface texture, rather than a chemical stain.<\/p>\n Crater rims differ<\/p>\n Near the crater rim, brighter and darker zones told a different story from the distant rays.<\/p>\n Blue-sensitive images showed cleaner subsurface grains in bright zones, meaning impact excavation lifted less-weathered material upward.<\/p>\n Darker nearby zones lacked that color change, which linked them to churned mature dust and small shadows.<\/p>\n Rim areas therefore carry both kinds of evidence: fresh material from depth and rough material from local fallout inside the ejecta blanket.<\/p>\n Apollo images help<\/p>\n Apollo astronaut photographs offered a ground-level check on how rough lunar dust affects brightness.<\/p>\n Boot scuffs darkened some soil because kicked grains made tiny shadow-casting textures across the surface.<\/p>\n Wheel tracks sometimes looked brighter after compaction crushed loose structure and reduced the number of small shadows.<\/p>\n Those human-made marks support the impact results, although rover tracks and crater<\/a> rays form by different forces.<\/p>\n A younger surface<\/p>\n Young craters may fade from view faster than their sharp rims alone would suggest, especially in faint outer zones.<\/p>\n Earlier LROC work found that new impacts churned the top inch (2.5 centimeters) of soil in about 81,000 years.<\/p>\n Phase-dependent splotches, small bright or dark impact marks, now imply that some small disturbances went unseen when images used gentler lighting.<\/p>\n A crater\u2019s age signal can therefore depend on when and how a spacecraft camera looked.<\/p>\n Lunar ice signals<\/p>\n Fast churning also matters for polar ice clues, not just for dating cratered ground.<\/p>\n Micro cold traps<\/a>, tiny sunless pockets that can preserve water ice, may survive only thousands of years when smaller than 3 feet (1 meter).<\/p>\n If surface dust overturns rapidly, fresh ice signs may mark recent delivery rather than ancient storage.<\/p>\n Future landers will need lighting history, surface texture, and depth together before reading those frozen records.<\/p>\n A dynamic lunar surface<\/p>\n The fading rays, color limits, angle tests, and Apollo comparisons all point to a Moon with an active surface.<\/p>\n Better maps of young craters can sharpen space-weathering models and guide future sampling. However, optical images still cannot reveal how deep every disturbance reaches.<\/p>\n The study is published in The Planetary Science Journal<\/a>.<\/p>\n \u2014\u2013<\/p>\n Like what you read?\u00a0Subscribe to our newsletter\u00a0<\/a>for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on\u00a0EarthSnap<\/a>, a free app brought to you by\u00a0Eric Ralls\u00a0<\/a>and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"Researchers have found that newly formed lunar craters disturb the Moon\u2019s surface over distances more than 1,000 times…\n","protected":false},"author":2,"featured_media":404245,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[23],"tags":[111,139,69,147,392],"class_list":["post-404244","post","type-post","status-publish","format-standard","has-post-thumbnail","category-space","tag-new-zealand","tag-newzealand","tag-nz","tag-science","tag-space"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/404244","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/comments?post=404244"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/posts\/404244\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media\/404245"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/media?parent=404244"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/categories?post=404244"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/nz\/wp-json\/wp\/v2\/tags?post=404244"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}