After defending his PhD thesis on modeling interstellar objects on Monday, June 30, Matthew Hopkins intended to take some well-deserved time off. It would appear the universe had other plans for him.<\/p>\n
The very next day, the Atlas Terrestrial-impact Last Alert System (ATLAS) telescope in Rio Hurtado, Chile, detected a mysterious object whizzing toward the Sun. Early observations suggested that it came from outside our solar system, potentially marking the third discovery of an interstellar object in history. Astronomers across the globe\u2014including Hopkins\u2014leapt into action, racing to gather as much data on this wandering space rock as they could. By Thursday, July 3, the International Astronomical Union\u2019s Minor Planet Center confirmed that an interstellar object was, indeed, traveling through our cosmic neighborhood<\/a>, naming it 3I\/ATLAS. Now, Hopkins and his colleagues believe they know where it came from.<\/p>\n \u201cIt\u2019s very exciting!\u201d Hopkins, an astrophysics graduate student at the University of Oxford, told IFLScience<\/a>. \u201cI\u2019ve been anticipating the chance to compare my predictions to new data for four years, and 3I\/ATLAS is already giving us new insights into this fascinating galaxy-spanning population.\u201d<\/p>\n Through preliminary observations, astronomers have learned a lot about 3I\/ATLAS. It\u2019s the largest and brightest interstellar object yet, according to Space.com<\/a>. Experts are fairly confident that it\u2019s a comet zipping through our solar system at incredibly high speeds. Upon its discovery, the object was traveling<\/a> 137,000 miles per hour (221,000 kilometers per hour), and it will speed up as it approaches the Sun. 3I\/ATLAS appears to be much bigger than the two interstellar objects that came before it: \u2018Oumuamua<\/a> and Comet 2I\/Borisov<\/a>. Early size estimates suggest<\/a> it could be 6 to 19 miles (10 to 30 kilometers) wide. Don\u2019t worry, there\u2019s no chance of this space rock hitting our planet, but it will safely make its closest approach to Earth on October 30.<\/p>\n Initial spectroscopy suggests<\/a> 3I\/ATLAS is redder in color than typical solar system comets, similar to some trans-Neptunian objects\u2014minor planets that orbit the Sun beyond Neptune\u2019s orbit\u2014or tiny, icy celestial bodies located between Jupiter and Neptune called Centaurs. Another study made<\/a> photometric observations of the object that found it to be similar in color to some solar system comets but markedly bluer than \u2018Oumuamua and 2I\/Borisov.<\/p>\n Together, these early findings paint a vivid picture of our solar system\u2019s latest guest, but figuring out where this comet came from is equally as important as figuring out what it looks like. Interstellar objects like this one are \u201cpristine, primordial remnants from the planet formation process in other planetary systems,\u201d Darryl Seligman, an associate professor of physics and astronomy at Michigan State University, wrote in an article for The Conversation<\/a>. Understanding 3I\/ATLAS\u2019s origin would allow astronomers to extrapolate information about how planets form in this foreign star system.<\/p>\n To that end, Hopkins and his colleagues analyzed 3I\/ATLAS using the Otautahi-Oxford model. This new model integrates data from the European Space Agency\u2019s (ESA) Gaia observatory with models of protoplanetary disk chemistry and galactic dynamics to predict the distributions of velocities, ages, and compositions across the interstellar object population in our cosmic neighborhood. Hopkins and several of his co-authors contributed<\/a> to the development of Otautahi-Oxford.<\/p>\n Their findings, which are currently available on the preprint server arXiv<\/a> and have yet to be peer-reviewed, suggest 3I\/ATLAS originated from a specific part of the Milky Way\u2019s galactic disk. This is the disk-like component of our galaxy that contains stars, gas, and dust and rotates in circular coplanar motion around the center of the galaxy. According to Hopkins\u2019s study, 3I\/ATLAS likely came from the thick part of the disc, which contains<\/a> about 10% of the stellar mass of the Milky Way. These stars are generally much older than those located in the galaxy\u2019s thin disk.<\/p>\n \u201cStudying its chemistry and dynamics will add to our understanding of how the processes of planetesimal formation and evolution happen across the Milky Way\u2019s disk, and how such objects respond to the Milky Way\u2019s potential,\u201d the study states. Planetesimals are diminutive celestial bodies\u2014like asteroids or comets\u2014that serve<\/a> as the building blocks of planets.<\/p>\n \u201c[Comet 3I\/ATLAS] is probably from an old star in the thick disc, and we think that it\u2019s likely that this thing\u2019s been out there for longer than the age of the Solar System,\u201d co-author Chris Lintott, a professor of astrophysics at Oxford, told IFLScience. \u201cThere\u2019s a two-thirds chance that it\u2019s older than 7 billion [years], and that would explain the color.\u201d\u00a0If confirmed, it would mark the first known interstellar object to visit from that distinct galactic population.<\/p>\n To test their hypothesis, the researchers will keep a close eye on 3I\/ATLAS as it approaches the Sun. Older stars tend to produce water-rich interstellar objects, Lintott explained. If this comet hails from the thick disk, it should produce a lot of cometary activity, which occurs when surface ice heats up and transitions directly from a solid to a gas. In the meantime, astronomers around the world will continue getting to know our galaxy\u2019s third interstellar visitor.<\/p>\n","protected":false},"excerpt":{"rendered":"After defending his PhD thesis on modeling interstellar objects on Monday, June 30, Matthew Hopkins intended to take…\n","protected":false},"author":3,"featured_media":52305,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24],"tags":[39035,4514,39036,159,783,39037,67,132,68],"class_list":{"0":"post-52304","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-space","8":"tag-3i-atlas","9":"tag-astronomy","10":"tag-interstellar-objects","11":"tag-science","12":"tag-space","13":"tag-the-milky-way","14":"tag-united-states","15":"tag-unitedstates","16":"tag-us"},"share_on_mastodon":{"url":"","error":""},"_links":{"self":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/posts\/52304","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/comments?post=52304"}],"version-history":[{"count":0,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/posts\/52304\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/media\/52305"}],"wp:attachment":[{"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/media?parent=52304"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/categories?post=52304"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.europesays.com\/us\/wp-json\/wp\/v2\/tags?post=52304"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}