  {"id":78669,"date":"2017-09-04T14:16:19","date_gmt":"2017-09-04T18:16:19","guid":{"rendered":"https:\/\/www.ucf.edu\/news\/?p=78669"},"modified":"2018-06-18T14:04:02","modified_gmt":"2018-06-18T18:04:02","slug":"ucf-physicist-reflects-end-cassini-mission-grateful-career-launch","status":"publish","type":"post","link":"https:\/\/www.ucf.edu\/news\/ucf-physicist-reflects-end-cassini-mission-grateful-career-launch\/","title":{"rendered":"麻豆原创 Physicist Reflects on End of Cassini Mission, Grateful for Career Launch"},"content":{"rendered":"<p>When NASA\u2019s Cassini mission ended on Sept. 15 by plunging into Saturn\u2019s atmosphere, one 麻豆原创 professor reminisced about the mission that launched his career and the family he\u2019s made throughout the almost 20-year journey.<\/p>\n<p>Physics Professor Josh Colwell began working on the Cassini mission right out of graduate school. As Cassini took its last dive through gaps in Saturn&#8217;s rings, which scientists had never had access to before, Colwell celebrated and mourned alongside the hundreds of scientists who worked on the mission.<\/p>\n<p>Listening to to the last radio signals from the spacecraft from NASA\u2019s Jet Propulsion Laboratory in California, the base of operations for the spacecraft maneuvers, was bittersweet, he said.<\/p>\n<p>Colwell&#8217;s mentor tapped him for the mission. Larry Esposito had been selected to lead the team that would be responsible for the Ultraviolet Imaging Spectrograph instrument that has given scientists so much amazing data about Saturn.<\/p>\n<p>Since then, Colwell continued to work with the team and has gone on to participate in several other NASA missions as well as microgravity flights with commercial space companies. The reason he became a planetary scientist was to dive into a single question: How did the solar system form?<\/p>\n<p>The findings Cassini has produced since arriving at Saturn in 2004 have often surprised and pushed scientists to explain the mysterious rings around the planet, whose origin is still unknown. Saturn still has many secrets about its interior, hidden beneath its thick atmosphere. Even the length of Saturn\u2019s day has been difficult to measure. Cassini\u2019s final orbits may unlock some of these mysteries.<\/p>\n<p>Some results:<\/p>\n<li>The rings have miniature moonlets within them that have reshaped the rings during Cassini\u2019s mission.<\/li>\n<li>Titan, Saturn\u2019s largest moon, has huge lakes of natural gas at its poles.<\/li>\n<li>Enceladus, one of Saturn\u2019s moons, has geysers spewing water vapor and organic chemicals from a subsurface ocean.<\/li>\n<li>The list goes on.<\/li>\n<p>\u201cCassini has revolutionized our understanding not only of Saturn, its moons and rings, but also Saturn\u2019s place in the history of the solar system,\u201d Colwell said. \u201cAnd many of those discoveries have been made years after its nominal four-year mission was due to end. After more than 13 years at the ringed planet, it\u2019s going out in a blaze of glory.\u201d<\/p>\n<p>Cassini launched from Kennedy Space Center in 1997 with the goal of exploring Saturn\u2019s rings, the planet, the planet-sized moon Titan, and the other icy moons nearby. There were many mysteries about the Saturn system with only limited data from fly-bys completed by Pioneer 11 and Voyagers 1 and 2 on their way outside the solar system.<\/p>\n<p>Even the spacecraft\u2019s death plunge is likely to produce first-of-its-kind data scientists are hungry for, Colwell said.<\/p>\n<p>The plunge will take the spacecraft through gaps in Saturn\u2019s rings that scientists have never had access to before. The measurements the team hopes to collect from that final dive should help researchers determine the exact mass of those mysterious rings as well as reveal the internal structure of the planet itself.<\/p>\n<p>So why do we care about mass? Scientists are unsure whether the rings are as old as Saturn or much younger. Knowing how much material is in the rings will provide a crucial clue to the ring age. In turn, this will shed light on how the planet formed and the history of the solar system as a whole.<\/p>\n<p>Colwell, an avid Star Trek fan, continues on his mission to unlock the secrets of how our solar system was formed. Cassini has provided valuable clues and the final plunge should provide more data to examine. It could answer some very old questions or spin off more if the data is unexpected.<\/p>\n<p>Colwell said the professional growth and friendships over 20 years have helped him become the scientist he is today. And even now, he\u2019s still as eager and energized to find answers to the questions that led him into this field.<\/p>\n<p>\u201cHow did the solar system form? How many other planets are out there like our own, and what will we find on all these strange new worlds?\u201d Colwell said.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"When NASA\u2019s Cassini mission ended on Sept. 15 by plunging into Saturn\u2019s atmosphere, one 麻豆原创 professor reminisced about the mission that launched his career and the family he\u2019s made throughout the almost 20-year journey. Physics Professor Josh Colwell began working on the Cassini mission right out of graduate school. As Cassini took its last dive through gaps in Saturn&#8217;s rings,&hellip;","protected":false},"author":16,"featured_media":61443,"comment_status":"open","ping_status":"closed","sticky":false,"template":"template-twocol.php","format":"standard","meta":{"_acf_changed":false,"lazy_load_responsive_images_disabled":false,"footnotes":"","_links_to":"","_links_to_target":"","_wp_rev_ctl_limit":""},"categories":[5,6,27],"tags":[4361,202],"tu_author":[],"class_list":["post-78669","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-colleges","category-community","category-student-life","tag-space","tag-alumni"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v22.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>麻豆原创 Physicist Reflects on End of Cassini Mission, Grateful for Career<\/title>\n<meta name=\"description\" content=\"When NASA\u2019s Cassini mission ended on Sept. 15 by plunging into Saturn\u2019s atmosphere, one 麻豆原创 professor reminisced about the mission that launched his\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.ucf.edu\/news\/ucf-physicist-reflects-end-cassini-mission-grateful-career-launch\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"麻豆原创 Physicist Reflects on End of Cassini Mission, Grateful for Career Launch\" \/>\n<meta property=\"og:description\" content=\"When NASA\u2019s Cassini mission ended on Sept. 15 by plunging into Saturn\u2019s atmosphere, one 麻豆原创 professor reminisced about the mission that launched his\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.ucf.edu\/news\/ucf-physicist-reflects-end-cassini-mission-grateful-career-launch\/\" \/>\n<meta property=\"og:site_name\" content=\"麻豆原创 News | 麻豆原创 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