{"id":25245,"date":"2024-10-18T02:43:08","date_gmt":"2024-10-17T21:13:08","guid":{"rendered":"https:\/\/vajiramandravi.com\/current-affairs\/?p=25245"},"modified":"2025-04-07T16:32:36","modified_gmt":"2025-04-07T11:02:36","slug":"brown-dwarfs","status":"publish","type":"post","link":"https:\/\/vajiramandravi.com\/current-affairs\/brown-dwarfs\/","title":{"rendered":"Brown dwarfs"},"content":{"rendered":"<h2><strong>About Brown dwarf:\u00a0<\/strong><\/h2>\n<ul>\n<li>Brown dwarfs are <strong>sometimes called failed<\/strong> stars because they\u2019re lighter than stars, but heavier than gas giant planets.<\/li>\n<li><strong>Features<\/strong>\n<ul>\n<li>These objects have a size between that of a giant planet like Jupiter and that of a small star.\u00a0<\/li>\n<li>Brown dwarfs <strong>accumulate material <\/strong>like a star, not like a planet.<\/li>\n<li>They can also <strong>have clouds made<\/strong> out of precipitates in their atmospheres. However, while we have water clouds on Earth, the clouds on brown dwarfs are much hotter and likely made up of hot silicate particles.<\/li>\n<li>Thus, they hold onto their lighter elements (hydrogen and helium) more effectively than planets and have a relatively low metal content.<\/li>\n<li>They <strong>do not have enough mass<\/strong> for <strong>their cores<\/strong> to burn nuclear fuel and radiate starlight. This is why they are sometimes referred to as \u201cfailed stars.\u201d<\/li>\n<li>The difference between brown dwarfs and stars is that, unlike stars, brown <strong>dwarfs do not reach stable luminosities<\/strong> by thermonuclear fusion of normal hydrogen.<\/li>\n<li>Both stars and brown dwarfs produce energy by fusion of deuterium (a rare isotope of hydrogen) in their first few million years.\u00a0<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<hr \/>\n<h3>Q1: What is deuterium?<\/h3>\n<p>It is an isotope of hydrogen with a nucleus consisting of one proton and one neutron, which is double the mass of the nucleus of ordinary hydrogen (one proton). Deuterium has an atomic weight of 2.014.\u00a0<\/p>\n<p><strong>Source: <\/strong><a href=\"https:\/\/indianexpress.com\/article\/technology\/science\/brown-dwarf-discovered-decades-ago-actually-twins-circling-9624039\/\" target=\"_blank\" rel=\"nofollow noopener\">A brown dwarf discovered 30 years ago is actually twins circling each other<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Brown dwarfs are celestial bodies bigger than a planet but smaller than a star <\/p>\n","protected":false},"author":5,"featured_media":25246,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[1],"tags":[],"class_list":{"0":"post-25245","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\/25245","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=25245"}],"version-history":[{"count":0,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/posts\/25245\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media\/25246"}],"wp:attachment":[{"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/media?parent=25245"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/categories?post=25245"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/vajiramandravi.com\/current-affairs\/wp-json\/wp\/v2\/tags?post=25245"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}