{"id":21192,"date":"2024-03-04T11:51:50","date_gmt":"2024-03-04T06:21:50","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=21192"},"modified":"2025-04-06T10:29:15","modified_gmt":"2025-04-06T04:59:15","slug":"protoplanetary-disk","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/protoplanetary-disk\/","title":{"rendered":"What is a Protoplanetary Disk?"},"content":{"rendered":"<h2>About Protoplanetary Disk<\/h2>\n<ul>\n<li>A protoplanetary disk is a\u00a0disk of gas (99% by mass)\u00a0and dust (1%),\u00a0orbiting a newly\u00a0formed star, from which\u00a0planets may eventually form or be in the process of forming.<\/li>\n<li>Disks are common\u00a0by-products of star formation, and range in mass from 0.001 to 0.3 Solar masses (1027\u20131029 kg) and in size from several tens to almost 1,000 Astronomical Units (1012\u20131014 m).<\/li>\n<li>How are they formed?\n<ul>\n<li>Stars form from cold\u00a0interstellar\u00a0molecular clouds. A molecular cloud is an interstellar cloud of gas and dust in which molecules can form, the most common of which is hydrogen (H2).\u00a0<\/li>\n<li>As they collapse into protostars\u00a0under the force of gravity, the\u00a0remaining matter\u00a0forms a spinning disk.<\/li>\n<li>Eventually, the star stops accreting matter,\u00a0leaving the disk in orbit around it.<\/li>\n<li>The\u00a0leftover gas and dust inside that protoplanetary disk\u00a0become the ingredients for planet formation.<\/li>\n<li>Organic molecules present in the original molecular cloud become part of the protoplanetary disk and the planets that form from it.<\/li>\n<\/ul>\n<\/li>\n<li>The\u00a0chemical composition of the protoplanetary disk determines the composition of the eventual\u00a0planets that form from it.\u00a0<\/li>\n<li>Protoplanetary disks\u00a0typically disperse after 2\u20133 million years\u00a0through the\u00a0coalescence of their matter into planets and photoevaporation by the stellar radiation.<\/li>\n<\/ul>\n<hr \/>\n<h3>Q1) What is the James Webb Space Telescope (JWST)?<\/h3>\n<p>JWST was built in collaboration between NASA, the European Space Agency (ESA), and the Canadian Space Agency. It was launched in December 2021. It is the largest and most powerful space telescope to date. It orbits around a point in space called the L2 Lagrange point (a gravitationally stable location in space). It is approximately 1.5 million km beyond Earth\u2019s orbit and is one of the five points in the orbital plane of the Earth-Sun system. It will focus on four main areas: the first light in the universe, the assembly of galaxies in the early universe, the birth of stars and protoplanetary systems, andplanets (including the origins of life).<\/p>\n<p><strong>Source:<\/strong> <a href=\"https:\/\/www.livescience.com\/space\/astronomy\/james-webb-telescope-spots-trouble-in-orion-nebula-stellar-winds-are-eroding-planet-forming-material-around-a-young-star\" target=\"_blank\" rel=\"nofollow noopener\"><u>James Webb telescope spots trouble in Orion Nebula: Stellar winds are eroding planet-forming material around a young star<\/u><\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A protoplanetary disk is a disk of gas (99% by mass) and dust (1%), orbiting a newly formed star, from which planets may eventually form or be in the process of forming.  <\/p>\n","protected":false},"author":5,"featured_media":21193,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-21192","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-upsc-prelims-current-affairs","8":"no-featured-image-padding"},"acf":[],"_links":{"self":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/21192","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/comments?post=21192"}],"version-history":[{"count":0,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/21192\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/21193"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=21192"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=21192"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=21192"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}