{"id":9647,"date":"2020-08-31T14:17:31","date_gmt":"2020-08-31T08:47:31","guid":{"rendered":"https:\/\/triumphias.com\/blog\/?p=9647"},"modified":"2020-08-31T14:17:31","modified_gmt":"2020-08-31T08:47:31","slug":"hangenberg-crisis","status":"publish","type":"post","link":"https:\/\/triumphias.com\/blog\/hangenberg-crisis\/","title":{"rendered":"Hangenberg Crisis"},"content":{"rendered":"<header class=\"entry-header\">\n<div class=\"entry-meta\"><span style=\"color: #0000ff;\"><strong>Relevance: Prelims: Geography<\/strong><\/span><\/div>\n<\/header>\n<div class=\"entry-content\">\n<p><span style=\"color: #ff0000;\"><strong>Why In News?<\/strong><\/span><\/p>\n<p>The\u00a0<strong>research, published in the Proceedings of the National Academy of Sciences<\/strong>\u00a0finds that E<strong>arth suffered an intense loss of species diversity<\/strong>\u00a0that lasted for at least 300,000 years, possibly caused by long-lasting ozone depletion.<\/p>\n<h4><span style=\"color: #ff0000;\"><strong>About:<\/strong><\/span><\/h4>\n<ul>\n<li>The explosion of a nearby star occurred at between Devonian and Carboniferous periods could have caused a\u00a0<strong>mass extinction event<\/strong>\u00a0that took place 359 million years ago.<\/li>\n<li><strong>Hangenberg crisis-\u00a0<\/strong>The event which led to an<strong>\u00a0intense loss of species<\/strong>\u00a0is thought to have been<strong>\u00a0caused by long-lasting ozone depletion<\/strong>, which would have allowed\u00a0<strong>much more of the Sun\u2019s ultraviolet (UV) radiation<\/strong>\u00a0to reach and harm life on Earth. This was called the\u00a0<strong>Hangenberg crisis.<\/strong><\/li>\n<\/ul>\n<h4><span style=\"color: #ff0000;\"><strong>What are the Researcher\u2019s viewpoints?<\/strong><\/span><\/h4>\n<ul>\n<li><strong>Extensive volcanism and global warming\u00a0<\/strong>can also\u00a0<strong>rupture the ozone layer<\/strong>\u00a0but shreds of evidence for these are indefinite as far as the time period is concerned.<\/li>\n<li>So, researchers consider that\u00a0<strong>one or more supernovae explosions<\/strong>, at a distance of 65 light-years away from the Earth, may have\u00a0<strong>caused a prolonged loss of ozone.<\/strong><\/li>\n<li>Events like gamma-ray bursts, solar eruptions and meteorite collisions end up very soon. As such, they cannot pave the way for gradual ozone depletion that took place at the close of the Devonian aeon.<\/li>\n<\/ul>\n<h4><span style=\"color: #ff0000;\"><strong>Theory of supernova incident:<\/strong><\/span><\/h4>\n<ul>\n<li>A supernova event can be powerful enough to bathe its galaxy in light for days and months alike. It can be spotted across the universe as well.<\/li>\n<li>Supernovae (SNe) are quick sources of\u00a0<strong>ionising photons that include fatal X-rays, UV and gamma rays.<\/strong>\u00a0Over a longer period of time, the bang clashes with the nearby gas, resulting in a shockwave that causes particle acceleration.<\/li>\n<li>As such,<strong>\u00a0cosmic rays are generated by SNe.<\/strong>\u00a0These charged particles with high energies get magnetically confined on the inside of SN remains.<\/li>\n<li>Researches propose that radioactive isotopes like plutonium-244 and samarium-146 should be discovered from the rocks and fossils dumped at the time of extinction. This, according to them, can prove the theory of supernova incident, mainly because isotopes don\u2019t have a natural existence on Earth.<\/li>\n<\/ul>\n<h4><span style=\"color: #ff0000;\"><strong>Conclusion:<\/strong><\/span><\/h4>\n<ul>\n<li>Life began on Earth some 3.5 billion years ago through a series of evolutionary changes. The recent research bounds us to think that life on Earth is not alone. In fact, it is affected by the responses of the cosmos that we all are a part of.<\/li>\n<\/ul>\n<p><span style=\"color: #0000ff;\"><strong>For more such notes, Articles, News &amp; Views Join our Telegram Channel.<\/strong><\/span><\/p>\n<p><a title=\"Telegram Link\" href=\"https:\/\/t.me\/triumphias\" target=\"_blank\"><span style=\"color: #ff0000;\"><strong>https:\/\/t.me\/triumphias<\/strong><\/span><\/a><\/p>\n<p><span style=\"color: #0000ff;\"><strong>Click the link below to see the details about the UPSC \u2013Civils courses offered by Triumph IAS.<\/strong> <\/span><span style=\"color: #ff0000;\"><strong><a style=\"color: #ff0000;\" title=\"Courses available\" href=\"https:\/\/triumphias.com\/pages-all-courses.php\">https:\/\/triumphias.com\/pages-all-courses.php<\/a><\/strong><\/span><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Relevance: Prelims: Geography Why In News? The\u00a0research, published in the Proceedings of the National Academy of Sciences\u00a0finds that Earth suffered<\/p>\n","protected":false},"author":1,"featured_media":9287,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[123,42],"tags":[392],"class_list":["post-9647","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-current-affairs","category-general-studies-iii-technology-economic-development-bio-diversity-environment-security-and-disaster-management","tag-union-public-service-commission-upsc"],"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/posts\/9647","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/comments?post=9647"}],"version-history":[{"count":1,"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/posts\/9647\/revisions"}],"predecessor-version":[{"id":9648,"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/posts\/9647\/revisions\/9648"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/media\/9287"}],"wp:attachment":[{"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/media?parent=9647"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/categories?post=9647"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/triumphias.com\/blog\/wp-json\/wp\/v2\/tags?post=9647"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}