{"id":3948,"date":"2021-06-02T09:00:03","date_gmt":"2021-06-02T13:00:03","guid":{"rendered":"https:\/\/orbitalhub.com\/?p=3948"},"modified":"2021-06-01T21:21:27","modified_gmt":"2021-06-02T01:21:27","slug":"baryon-acoustic-oscillations","status":"publish","type":"post","link":"https:\/\/orbitalhub.com\/?p=3948","title":{"rendered":"Baryon Acoustic Oscillations"},"content":{"rendered":"<div style=\"float: left; padding-right: 30px;\">\n<p class=\"MsoNormal\" style=\"margin: 5px;\">&nbsp;<\/p>\n<p class=\"MsoNormal\" style=\"margin: 5px;\">\n<iframe loading=\"lazy\" width=\"580\" height=\"326\" src=\"https:\/\/www.youtube.com\/embed\/Y8W9T6ahwSU\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe>\n<\/p>\n<p class=\"MsoNormal\" style=\"margin: 5px;\">&nbsp;<\/p>\n<p>NASA dicit:<\/p>\n<p>Sound waves from the nascent universe, called baryon acoustic oscillations (BAOs), left their imprint on the cosmos by influencing galaxy distribution. Researchers have explored this imprint back to when the universe was three billion years old, or roughly 20% of its current age of 13.8 billion years. <\/p>\n<p>For most of its first half-million years, the universe looked extremely different than it does today. Instead of being speckled with stars and galaxies, the cosmos was filled with a sea of plasma \u2013 charged particles \u2013 that formed a dense, almost uniform fluid. <\/p>\n<p>There were tiny fluctuations of about one part in 100,000. What few variations there were took the form of slightly denser kernels of matter, like a single ounce of cinnamon sprinkled into about 13,000 cups of cookie dough. Since the clumps had more mass, their gravity attracted additional material. <\/p>\n<p>It was so hot that particles couldn\u2019t stick together when they collided \u2013 they just bounced off each other. Alternating between the pull of gravity and this repelling effect created waves of pressure \u2013 sound \u2013 that propagated through the plasma. <\/p>\n<p>Over time, the universe cooled and particles combined to form neutral atoms. Because the particles stopped repelling each other, the waves ceased. Their traces, however, still linger, etched on the cosmos. <\/p>\n<p>Video credit: NASA&#8217;s Goddard Space Flight Center\/Scott Wiessinger (USRA): Lead Producer\/Scott Wiessinger (USRA): Lead Animator\/Ashley Balzer (ADNET): Lead Science Writer\/Jason D. Rhodes (JPL): Scientist\/Katarina Markovic (JPL): Scientist\/Scott Wiessinger (USRA): Narrator <\/p>\n<p class=\"MsoNormal\" style=\"margin: 5px;\">&nbsp;<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Sound waves from the nascent universe, called baryon acoustic oscillations (BAOs), left their imprint on the cosmos by influencing galaxy distribution.<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[391,463],"tags":[855],"class_list":["post-3948","post","type-post","status-publish","format-standard","hentry","category-astronomy","category-videos","tag-baos"],"_links":{"self":[{"href":"https:\/\/orbitalhub.com\/index.php?rest_route=\/wp\/v2\/posts\/3948","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/orbitalhub.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/orbitalhub.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/orbitalhub.com\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/orbitalhub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3948"}],"version-history":[{"count":3,"href":"https:\/\/orbitalhub.com\/index.php?rest_route=\/wp\/v2\/posts\/3948\/revisions"}],"predecessor-version":[{"id":3951,"href":"https:\/\/orbitalhub.com\/index.php?rest_route=\/wp\/v2\/posts\/3948\/revisions\/3951"}],"wp:attachment":[{"href":"https:\/\/orbitalhub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3948"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/orbitalhub.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3948"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/orbitalhub.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3948"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}