{"id":42322,"date":"2024-06-10T12:59:01","date_gmt":"2024-06-10T12:59:01","guid":{"rendered":"https:\/\/edukemy.com\/blog\/?p=42322"},"modified":"2024-06-10T12:59:02","modified_gmt":"2024-06-10T12:59:02","slug":"outer-space-hydrogen-line-upsc","status":"publish","type":"post","link":"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/","title":{"rendered":"Outer Space &#8211; Hydrogen Line &#8211; UPSC"},"content":{"rendered":"\n<figure class=\"wp-block-image size-full\"><a href=\"https:\/\/edukemy.com\/upsc-current-affairs?utm_source=Blog&amp;utm_medium=Banner&amp;utm_campaign=Current+Affairs\" target=\"_blank\" rel=\"noreferrer noopener\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1280\" height=\"300\" src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2024\/06\/19.png\" alt=\"\" class=\"wp-image-42406\" srcset=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2024\/06\/19.png 1280w, https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2024\/06\/19-1170x274.png 1170w, https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2024\/06\/19-585x137.png 585w\" sizes=\"(max-width: 1280px) 100vw, 1280px\" \/><\/a><\/figure>\n\n\n\n<p>Outer space, the vast expanse beyond our atmosphere, holds secrets that intrigue and mystify us. One of these mysteries involves something called the &#8220;Hydrogen Line,&#8221; which might sound complex, but in simple terms, it&#8217;s like tuning into a cosmic radio station. You see, hydrogen is the most abundant element in the universe, and it emits a special type of radio wave that can travel through space. Scientists use a special frequency to listen in on these hydrogen waves, like tuning into a specific channel on your radio. This &#8220;Hydrogen Line&#8221; helps astronomers map out the universe, locate celestial objects, and even understand how galaxies form and evolve. It&#8217;s like eavesdropping on the universe&#8217;s conversations, giving us insights into its history and workings. So, when you think about outer space, remember that even the quietest corners are buzzing with cosmic chatter, waiting for us to listen in and decode its secrets.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p><strong>Tags: GS-3, Science &amp; Technology \u2014 Hydrogen Line and its significance in interstellar studies<\/strong>\u00a0<\/p><\/blockquote>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_73 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<label for=\"ez-toc-cssicon-toggle-item-69ed5158c6c50\" class=\"ez-toc-cssicon-toggle-label\"><p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<span class=\"ez-toc-cssicon\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69ed5158c6c50\"  \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/#Why_in_the_News\" title=\"Why in the News?&nbsp;\">Why in the News?&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/#What_is_a_hydrogen_line\" title=\"What is a hydrogen line?&nbsp;\">What is a hydrogen line?&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/#Why_is_the_Hydrogen_line_Important\" title=\"Why is the Hydrogen line Important?&nbsp;\">Why is the Hydrogen line Important?&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/#How_Do_We_Interpret_Hydrogen_Lines\" title=\"How Do We Interpret Hydrogen Lines?&nbsp;\">How Do We Interpret Hydrogen Lines?&nbsp;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/#Whats_next\" title=\"What&#8217;s next?&nbsp;\">What&#8217;s next?&nbsp;<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/#UPSC_Civil_Services_Examination_PYQ\" title=\"UPSC Civil Services Examination\u00a0 PYQ\u00a0\">UPSC Civil Services Examination\u00a0 PYQ\u00a0<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/#Prelims\" title=\"Prelims:&nbsp;\">Prelims:&nbsp;<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/#FAQs\" title=\"FAQs\">FAQs<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/#Q_What_is_the_Hydrogen_Line_in_outer_space\" title=\"Q: What is the Hydrogen Line in outer space?\">Q: What is the Hydrogen Line in outer space?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/#Q_Why_is_the_Hydrogen_Line_important_for_studying_outer_space\" title=\"Q: Why is the Hydrogen Line important for studying outer space?\">Q: Why is the Hydrogen Line important for studying outer space?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/#Q_How_do_astronomers_detect_the_Hydrogen_Line\" title=\"Q: How do astronomers detect the Hydrogen Line?\">Q: How do astronomers detect the Hydrogen Line?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/#Q_What_can_studying_the_Hydrogen_Line_tell_us_about_the_universe\" title=\"Q: What can studying the Hydrogen Line tell us about the universe?\">Q: What can studying the Hydrogen Line tell us about the universe?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/#Q_How_does_the_Hydrogen_Line_relate_to_the_search_for_extraterrestrial_life\" title=\"Q: How does the Hydrogen Line relate to the search for extraterrestrial life?\">Q: How does the Hydrogen Line relate to the search for extraterrestrial life?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/#In_case_you_still_have_your_doubts_contact_us_on_9811333901\" title=\"In case you still have your doubts, contact us on 9811333901.&nbsp;\">In case you still have your doubts, contact us on 9811333901.&nbsp;<\/a><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><ul class='ez-toc-list-level-4' ><li class='ez-toc-heading-level-4'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/edukemy.com\/blog\/outer-space-hydrogen-line-upsc\/#Visit_our_YouTube_Channel_%E2%80%93_here\" title=\"Visit our YouTube Channel &#8211;&nbsp;here\">Visit our YouTube Channel &#8211;&nbsp;here<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_in_the_News\"><\/span><strong>Why in the News?<\/strong>&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>The hydrogen line is an important tool in modern astronomy, serving a variety of objectives ranging from analysing distant stars to searching for extraterrestrial civilization, if it exists.&nbsp;<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_is_a_hydrogen_line\"><\/span><strong>What is a hydrogen line?<\/strong>&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>The hydrogen line is a unique form of light that hydrogen atoms release.&nbsp;<\/li><li>It occurs when an electron, a small particle that circles the nucleus of a hydrogen atom, transitions from a higher to a lower energy level.&nbsp;<\/li><li>This jump releases energy in the form of light, with a wavelength of approximately 21 centimetres. Scientists refer to this wavelength as the hydrogen line.&nbsp;<\/li><\/ul>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><img decoding=\"async\" width=\"282\" height=\"258\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2024\/06\/image-1.png\" alt=\"\" class=\"wp-image-42324 lazyload\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 282px; --smush-placeholder-aspect-ratio: 282\/258;\" \/><figcaption><strong>Hydrogen line <\/strong><\/figcaption><\/figure><\/div>\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Why_is_the_Hydrogen_line_Important\"><\/span><strong>Why is the Hydrogen line Important?<\/strong>&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>Hydrogen exists everywhere in the universe. It is the simplest and most abundant element, accounting for approximately 75% of the universe&#8217;s elemental mass.&nbsp;<\/li><li>So, studying the hydrogen line teaches us a lot about the composition and distribution of stuff in the cosmos.&nbsp;<\/li><li>Astronomers can generate maps of the location of hydrogen gas by studying the emission of the hydrogen line from various regions of space.&nbsp;<\/li><li>Secrets of the early Universe: The hydrogen line also contains information about the early universe. Shortly after the Big Bang, the cosmos was filled with hydrogen gas.&nbsp;<\/li><li>Astronomers can learn about the environment and evolution of the hydrogen line from remote parts of the universe.&nbsp;<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_Do_We_Interpret_Hydrogen_Lines\"><\/span><strong>How Do We Interpret Hydrogen Lines?<\/strong>&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>Radio telescope data allows for hydrogen distribution mapping, which reveals the locations of hydrogen clouds that are critical for understanding galaxy and galaxy cluster formation and evolution.&nbsp;<\/li><li>Observing hydrogen line emission from various galaxy components allows researchers to examine internal structures and dynamics, including rotation curves, which provide insights into mass distribution inside galaxies.&nbsp;<\/li><li>Observing hydrogen lines from distant galaxies reveals early cosmos conditions, which aids in comprehending cosmic evolution&#8217;s early stages.&nbsp;<\/li><\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Whats_next\"><\/span><strong>What&#8217;s next?<\/strong>&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\"><li>Scientists are constantly creating new technologies and ways to increase radio telescope sensitivity and resolution.&nbsp;<\/li><li>This allows them to identify fainter signals and gain fresh information about the universe&#8217;s hydrogen concentration.&nbsp;<\/li><li>The hydrogen line measurements may also help us understand dark matter, an invisible component that accounts for approximately 27% of the universe&#8217;s total mass-energy content.&nbsp;<\/li><li>Scientists want to shed light on the nature of dark matter by investigating the distribution of hydrogen in connection to gravitational forces detected in galaxies.&nbsp;<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"UPSC_Civil_Services_Examination_PYQ\"><\/span><strong>UPSC Civil Services Examination\u00a0 PYQ<\/strong>\u00a0<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Prelims\"><\/span><strong>Prelims:<\/strong>&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><strong>Q:1 A team of scientists at Brookhaven National Laboratory including those from India created the heaviest antimatter (anti-helium nucleus). What is\/are the implication\/implications of the creation of antimatter? (2012)<\/strong>&nbsp;<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>It will make mineral prospecting and oil exploration easier and cheaper.\u00a0<\/li><li>It will help prove the possibility of the existence of stars and galaxies made of antimatter.\u00a0<\/li><li>It will help us understand the evolution of the universe.\u00a0<\/li><\/ol>\n\n\n\n<p><strong>Select the correct answer using the codes given below:<\/strong>&nbsp;<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>1 only\u00a0<\/li><li>2 and 3 only\u00a0<\/li><li>3 only\u00a0<\/li><li>1, 2 and 3\u00a0<\/li><\/ol>\n\n\n\n<p><strong>Answer: (b)<\/strong>&nbsp;<\/p>\n\n\n\n<p><strong>Source:<\/strong><strong> <\/strong><a href=\"https:\/\/www.thehindu.com\/sci-tech\/science\/astronomers-detect-radio-signal-originating-from-atomic-hydrogen-in-extremely-distant-galaxy\/article66386406.ece\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>TH<\/strong><\/a><strong><\/strong>&nbsp;<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"FAQs\"><\/span>FAQs<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q_What_is_the_Hydrogen_Line_in_outer_space\"><\/span>Q: <strong>What is the Hydrogen Line in outer space?<\/strong> <span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>The Hydrogen Line, often called the &#8220;21-centimeter line,&#8221; refers to a specific wavelength of radio waves emitted by hydrogen atoms. When the electron in a hydrogen atom flips its spin, it releases energy in the form of a radio wave with a wavelength of about 21 centimeters. Scientists study this line to explore the presence of hydrogen gas in space, helping them map out cosmic structures like galaxies and nebulae.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q_Why_is_the_Hydrogen_Line_important_for_studying_outer_space\"><\/span>Q: <strong>Why is the Hydrogen Line important for studying outer space?<\/strong> <span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>The Hydrogen Line is crucial because hydrogen is the most abundant element in the universe. By detecting its radio emissions, astronomers can map out the distribution of hydrogen gas in space, which gives insights into the formation and evolution of cosmic structures. It helps us understand how galaxies form, how stars are born, and even how the universe itself evolves over time.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q_How_do_astronomers_detect_the_Hydrogen_Line\"><\/span>Q: <strong>How do astronomers detect the Hydrogen Line?<\/strong> <span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Astronomers use radio telescopes to detect the Hydrogen Line. These telescopes are specifically designed to capture radio waves emitted by celestial objects. By tuning into the 21-centimeter wavelength, astronomers can pinpoint the presence of hydrogen gas in different regions of space. This technique allows them to create detailed maps of the cosmos and unravel its mysteries.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q_What_can_studying_the_Hydrogen_Line_tell_us_about_the_universe\"><\/span>Q: <strong>What can studying the Hydrogen Line tell us about the universe?<\/strong> <span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Studying the Hydrogen Line provides valuable information about the structure and dynamics of the universe. It helps astronomers map the distribution of matter, including dark matter, which does not emit light but affects the movement of hydrogen gas. By studying how hydrogen is distributed and how it moves, scientists can better understand the large-scale structure of the cosmos and the processes driving its evolution.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Q_How_does_the_Hydrogen_Line_relate_to_the_search_for_extraterrestrial_life\"><\/span>Q: <strong>How does the Hydrogen Line relate to the search for extraterrestrial life?<\/strong> <span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>While the Hydrogen Line itself doesn&#8217;t directly detect life, it plays a role in the search for extraterrestrial civilizations. Some scientists propose that advanced alien civilizations might intentionally broadcast radio signals at the Hydrogen Line frequency, knowing that it&#8217;s a universal marker for intelligent life. By scanning for such signals, astronomers hope to detect signs of extraterrestrial intelligence amidst the cosmic background noise.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full is-resized\"><a href=\"https:\/\/edukemy.com\/upsc\/upsc-essay?utm_source=Blog&amp;utm_medium=Banner&amp;utm_campaign=Essay\" target=\"_blank\" rel=\"noreferrer noopener\"><img decoding=\"async\" data-src=\"https:\/\/edukemy.com\/blog\/wp-content\/uploads\/2024\/06\/UPSC-Essay-Course-1280\u00d7300-1-3.svg\" alt=\"\" class=\"wp-image-42688 lazyload\" width=\"781\" height=\"182\" src=\"data:image\/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw==\" style=\"--smush-placeholder-width: 781px; --smush-placeholder-aspect-ratio: 781\/182;\" \/><\/a><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"In_case_you_still_have_your_doubts_contact_us_on_9811333901\"><\/span><strong>In case you still have your doubts, contact us on 9811333901.<\/strong>&nbsp;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>For UPSC Prelims Resources,&nbsp;<a href=\"https:\/\/edukemy.com\/upsc-cse-prelims-resource-centre\" target=\"_blank\" rel=\"noreferrer noopener\">Click here<\/a><\/p>\n\n\n\n<p>For Daily Updates and Study Material:<\/p>\n\n\n\n<p>Join our Telegram Channel &#8211;&nbsp;<a href=\"https:\/\/t.me\/WithEdukemy4IAS\" target=\"_blank\" rel=\"noreferrer noopener\">Edukemy for IAS<\/a><\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>1. Learn through Videos &#8211;&nbsp;<a href=\"https:\/\/bit.ly\/3vOD8sU\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a><\/li><li>2. Be Exam Ready by Practicing Daily MCQs &#8211;&nbsp;<a href=\"https:\/\/bit.ly\/3Q9z2nF\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a><\/li><li>3. Daily Newsletter &#8211; Get all your Current Affairs Covered &#8211;&nbsp;<a href=\"https:\/\/bit.ly\/3bE2y5J\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a><\/li><li>4. Mains Answer Writing Practice &#8211;&nbsp;<a href=\"https:\/\/bit.ly\/3mZuVxl\" target=\"_blank\" rel=\"noreferrer noopener\">here<\/a><\/li><\/ul>\n\n\n\n<h4 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Visit_our_YouTube_Channel_%E2%80%93_here\"><\/span>Visit our YouTube Channel &#8211;&nbsp;<a href=\"https:\/\/www.youtube.com\/@EduKemyforIAS\">here<\/a><span class=\"ez-toc-section-end\"><\/span><\/h4>\n","protected":false},"excerpt":{"rendered":"<p>This &#8220;Hydrogen Line&#8221; helps astronomers map out the universe, locate celestial objects, and even understand how galaxies form and evolve.<\/p>\n","protected":false},"author":21,"featured_media":42323,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_eb_attr":"","om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_lmt_disableupdate":"","_lmt_disable":"","footnotes":""},"categories":[265],"tags":[3395,232,3385,706,140],"class_list":["post-42322","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-current-affairs","tag-hydrogen-line","tag-upsc","tag-upsc-geography-optional-mains","tag-upsc-geogrpahy","tag-upsc_preparation_strategy"],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/posts\/42322","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/users\/21"}],"replies":[{"embeddable":true,"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/comments?post=42322"}],"version-history":[{"count":1,"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/posts\/42322\/revisions"}],"predecessor-version":[{"id":42325,"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/posts\/42322\/revisions\/42325"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/media\/42323"}],"wp:attachment":[{"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/media?parent=42322"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/categories?post=42322"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/edukemy.com\/blog\/wp-json\/wp\/v2\/tags?post=42322"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}