{"id":778846,"date":"2024-03-13T14:49:53","date_gmt":"2024-03-13T19:49:53","guid":{"rendered":"https:\/\/spaceweekly.com\/?p=778846"},"modified":"2024-03-13T14:49:53","modified_gmt":"2024-03-13T19:49:53","slug":"what-can-we-learn-flying-through-the-plumes-at-enceladus","status":"publish","type":"post","link":"https:\/\/spaceweekly.com\/?p=778846","title":{"rendered":"What Can We Learn Flying Through the Plumes at Enceladus?"},"content":{"rendered":"<p> <br \/>\n<\/p>\n<div>\n<p>In the next decade, space agencies will expand the search for extraterrestrial life beyond Mars, where all of our astrobiology efforts are currently focused. This includes the ESA\u2019s <em>JUpiter ICy moon\u2019s Explorer<\/em> (JUICE) and NASA\u2019s <em>Europa Clipper<\/em>, which will fly past Europa and Ganymede repeatedly to study their surfaces and interiors. There\u2019s also NASA\u2019s proposed <em>Dragonfly <\/em>mission that will fly to Titan and study its atmosphere, methane lakes, and the rich organic chemistry happening on its surface. But perhaps the most compelling destination is Enceladus and the lovely plumes emanating from its southern polar region.<\/p>\n<p>Since the <em>Cassini <\/em>mission got a close-up look at these plumes, scientists have been aching to send a robotic mission there to sample them \u2013 which appear to have all the ingredients for life in them. This is not as easy as it sounds, and there\u2019s no indication flying through plumes will yield intact samples. In a recent paper, researchers from the University of Kent examined how the velocity of a passing spacecraft (and the resulting shock of impact) could significantly affect its ability to sample water and ice within the plumes. <\/p>\n<p><span id=\"more-165946\"\/><\/p>\n<p>The research was conducted by Prof. Mark Burchell and Dr. Penny Wozniakiewicz (an Emeritus Professor and a Senior Lecturer in Space Science) from the Centre for Astrophysics and Planetary Science (CAPS), part of the School of Physics and Astronomy at the University of Kent, UK. Their work could have significant implications for missions to Icy Ocean Worlds (IOW), bodies in the outer Solar System composed predominantly of frozen water and volatiles with oceans in their interior. These bodies have become of increasing interest to scientists since it is possible some could support life.<\/p>\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\">\n<p>\n<span class=\"embed-youtube\" style=\"text-align:center; display: block;\"><iframe loading=\"lazy\" title=\"Getting Samples From Enceladus Is Harder Than You Think\" width=\"1110\" height=\"624\" src=\"https:\/\/www.youtube.com\/embed\/xB1Tr3MWKKw?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" allowfullscreen><\/iframe><\/span>\n<\/p>\n<\/figure>\n<p>The term \u201cOcean Worlds\u201d has become common in recent years as the number of potential candidates for exploration has increased. Since the <em>Voyager <\/em>probes passed through the system in 1979, scientists have speculated about the possibility of an interior ocean within Europa based on its surface features. This included patches of \u201cyoung terrain\u201d sitting next to older, cratered terrain \u2013 indicative of regular exchanges between the surface and interior. The <em>Voyager <\/em>probes noticed similarly youthful terrain on Enceladus when they few past Saturn in 1980 and 81 (respectively).<\/p>\n<p>However, it was the <em>Cassini-Huygens<\/em> mission that discovered water vapor and organic molecules venting from the Enceladus\u2019 southern polar region in 2004. Over the next thirteen years, the Cassini orbiter conducted several more flybys of the moon, yielding additional evidence of an interior ocean and an energy source at the core-mantle boundary. These findings placed Enceladus among the \u201cOcean Worlds\u201d that scientists want to examine more closely with future missions. But unlike other IOWs, Enceladus is particularly attractive because of the nature of the plumes around its south pole.<\/p>\n<p>Whereas Europa also experiences plume activity, these are more sporadic and difficult to detect. Due to Europa\u2019s higher gravity (~13% vs. 1% of Earth\u2019s), water vapor and vented material don\u2019t reach nearly as far into space. As Burchell told Universe Today via email, collecting samples from these plumes seems relatively simple, at least in theory. \u201cLike all IOWs, it has an internal ocean with lots of water. What is in that water is the subject of much speculation and interest,\u201d he said. \u201cAnd Enceladus ejects plumes of water into space, making any space mission that wants to sample the water much easier \u2013 you can just fly through the plume.\u201d<\/p>\n<p>However, in the realm of practice (as always), things get a little more complicated. Depending on how fast a mission is traveling, the impact it will inflict upon plume material will vary considerably. As Burchell explains, this could jeopardize the very samples a mission was trying to obtain:<\/p>\n<blockquote class=\"wp-block-quote\">\n<p>\u201cThe problem with collecting samples at speed is that a lot of testing has been done with metal and mineral projectile, but less is known about the response of organics to the high-speed impacts. The bonds in the organics will break, but at what speed? And which bonds first? So what you end up with for analysis may not be what came out of Enceladus. But with what biases? What degree of alteration? Understanding this is essential to any successful collection of samples.\u201d<\/p>\n<\/blockquote>\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large\"><figcaption class=\"wp-element-caption\"><em>Artist rendering showing an interior cross-section of the crust of Enceladus, which shows how hydrothermal activity may be causing the plumes of water at the moon\u2019s surface. Credits: NASA-GSFC\/SVS, NASA\/JPL-Caltech\/SwRI<\/em><\/figcaption><\/figure>\n<\/div>\n<p>According to Burchell, modeling how a spacecraft\u2019s velocity would affect its ability to collect samples can be accomplished in one of two ways. On the one hand, there\u2019s the computer modeling approach, where teams rely on advanced software to simulate impacts and measure the results. The other is the \u201ckinetic\u201d approach, which consists of firing small grains at targets at the right speeds and then measuring the force of impact. Burchell and his team prefer to do the latter. \u201cIn our lab, we like firing things at targets,\u201d he said. <\/p>\n<p>Their results clearly showed that the collection speed is critical to sample collection. However, they also found that the results vary from one body to the next. Said Burchell: <\/p>\n<blockquote class=\"wp-block-quote\">\n<p>\u201cIn an orbit at a small body like Enceladus, it is fairly low. But for the larger IOWs, it is greater. And it just gets into the regime where the shock of the impact process in the collection causes increasingly severe alteration to the samples. If you do a flypast of the IOW without orbiting it, you are faster again, and the samples experience a greater shock. It suggests a low-speed orbital collection is best for un-shocked, minimally processed samples. But that needs more spacecraft design and restricts the other science you could do. It is always a tradeoff.\u201d<\/p>\n<\/blockquote>\n<p>Without the Solar System, there are several bodies where water and other volatiles are vented from the interior \u2013 a phenomenon known as cryovolcanism. These bodies vary considerably in terms of their size and gravitational pull, ranging from the microgravity (less or slightly more than 1%) of Mimas and Enceladus to the roughly 13-15% of Europa, Titan, and Ganymede. As a result, these findings could help inform the design of many sample-collection missions destined for IOWs. <\/p>\n<p><em>Further Reading: Meteoritics &amp; Planetary Science<\/em><\/p>\n<div class=\"sharedaddy sd-block sd-like jetpack-likes-widget-wrapper jetpack-likes-widget-unloaded\" id=\"like-post-wrapper-24000880-165946-65f2011669b09\" data-src=\"https:\/\/widgets.wp.com\/likes\/?ver=13.2#blog_id=24000880&amp;post_id=165946&amp;origin=www.universetoday.com&amp;obj_id=24000880-165946-65f2011669b09&amp;n=1\" data-name=\"like-post-frame-24000880-165946-65f2011669b09\" data-title=\"Like or Reblog\">\n<h3 class=\"sd-title\">Like this:<\/h3>\n<p><span class=\"button\"><span>Like<\/span><\/span> <span class=\"loading\">Loading&#8230;<\/span><\/p>\n<p><span class=\"sd-text-color\"\/><\/div>\n<\/p><\/div>\n<p><br \/>\n<br \/><a href=\"https:\/\/www.universetoday.com\/165946\/what-can-we-learn-flying-through-the-plumes-at-enceladus\/?rand=772204\">Source link <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In the next decade, space agencies will expand the search for extraterrestrial life beyond Mars, where all of our astrobiology efforts are currently focused. This includes the ESA\u2019s JUpiter ICy&hellip; <\/p>\n","protected":false},"author":1,"featured_media":775778,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[13],"tags":[],"class_list":["post-778846","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-genaero"],"_links":{"self":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts\/778846","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=778846"}],"version-history":[{"count":0,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/posts\/778846\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=\/wp\/v2\/media\/775778"}],"wp:attachment":[{"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=778846"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=778846"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/spaceweekly.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=778846"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}