{"id":265,"date":"2023-01-29T20:18:08","date_gmt":"2023-01-29T20:18:08","guid":{"rendered":"https:\/\/2024.caiopenedo.com\/?p=265"},"modified":"2023-01-29T22:48:12","modified_gmt":"2023-01-29T22:48:12","slug":"spacetime","status":"publish","type":"post","link":"https:\/\/2024.caiopenedo.com\/index.php\/2023\/01\/29\/spacetime\/","title":{"rendered":"Spacetime"},"content":{"rendered":"\n<h3 class=\"has-text-align-center wp-block-heading\"><strong>Spacetime<\/strong><\/h3>\n\n\n\n\n\n<p class=\"wp-block-paragraph\">In&nbsp;physics,&nbsp;<strong>spacetime<\/strong>&nbsp;is a&nbsp;mathematical model&nbsp;that combines the&nbsp;three dimensions of space&nbsp;and one&nbsp;dimension&nbsp;of&nbsp;time&nbsp;into a single&nbsp;four-dimensional&nbsp;manifold.&nbsp;Spacetime diagrams&nbsp;can be used to visualize&nbsp;relativistic&nbsp;effects, such as why different observers perceive differently where and when events occur.<\/p>\n\n\n\n\n\n<p class=\"wp-block-paragraph\">Until the 20th century, it was assumed that the three-dimensional geometry of the universe (its spatial expression in terms of coordinates, distances, and directions) was independent of one-dimensional time. The physicist&nbsp;Albert Einstein&nbsp;helped develop the idea of spacetime as part of his&nbsp;theory of relativity. Prior to his pioneering work, scientists had two separate theories to explain physical phenomena:&nbsp;Isaac Newton&#8217;s laws of physics described the motion of massive objects, while&nbsp;James Clerk Maxwell&#8217;s electromagnetic models explained the properties of light. However, in 1905, Einstein based&nbsp;a work on special relativity&nbsp;on two postulates:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The laws of physics are&nbsp;invariant&nbsp;(i.e., identical) in all&nbsp;inertial systems&nbsp;(i.e., non-accelerating frames of reference)<\/li>\n\n\n\n<li>The&nbsp;speed of light&nbsp;in&nbsp;a vacuum&nbsp;is the same for all inertial observers, regardless of the motion of the light source.<\/li>\n<\/ul>\n\n\n\n\n\n<p class=\"wp-block-paragraph\">The logical consequence of taking these postulates together is the inseparable joining of the four dimensions\u2014hitherto assumed as independent\u2014of space and time. Many counterintuitive consequences emerge: in addition to being independent of the motion of the light source, the speed of light is constant regardless of the frame of reference in which it is measured; the distances and even temporal ordering of pairs of events change when measured in different&nbsp;inertial frames of reference&nbsp;(this is the&nbsp;relativity of simultaneity); and the linear additivity of velocities no longer holds true.<\/p>\n\n\n","protected":false},"excerpt":{"rendered":"<p>Spacetime In&nbsp;physics,&nbsp;spacetime&nbsp;is a&nbsp;mathematical model&nbsp;that combines the&nbsp;three dimensions of space&nbsp;and one&nbsp;dimension&nbsp;of&nbsp;time&nbsp;into a single&nbsp;four-dimensional&nbsp;manifold.&nbsp;Spacetime diagrams&nbsp;can be used to visualize&nbsp;relativistic&nbsp;effects, such as why different observers perceive differently where and when events occur. Until the 20th century, it was assumed that the three-dimensional geometry of the universe (its spatial expression in terms of coordinates, distances, and directions) was independent [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":165,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"saved_in_kubio":false,"footnotes":""},"categories":[11],"tags":[23,21,13,25],"class_list":["post-265","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-space-log","tag-black-hole","tag-exploration","tag-space","tag-spacetime"],"_links":{"self":[{"href":"https:\/\/2024.caiopenedo.com\/index.php\/wp-json\/wp\/v2\/posts\/265","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/2024.caiopenedo.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/2024.caiopenedo.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/2024.caiopenedo.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/2024.caiopenedo.com\/index.php\/wp-json\/wp\/v2\/comments?post=265"}],"version-history":[{"count":6,"href":"https:\/\/2024.caiopenedo.com\/index.php\/wp-json\/wp\/v2\/posts\/265\/revisions"}],"predecessor-version":[{"id":296,"href":"https:\/\/2024.caiopenedo.com\/index.php\/wp-json\/wp\/v2\/posts\/265\/revisions\/296"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/2024.caiopenedo.com\/index.php\/wp-json\/wp\/v2\/media\/165"}],"wp:attachment":[{"href":"https:\/\/2024.caiopenedo.com\/index.php\/wp-json\/wp\/v2\/media?parent=265"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/2024.caiopenedo.com\/index.php\/wp-json\/wp\/v2\/categories?post=265"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/2024.caiopenedo.com\/index.php\/wp-json\/wp\/v2\/tags?post=265"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}