{"id":87253,"date":"2022-12-18T22:02:00","date_gmt":"2022-12-19T02:02:00","guid":{"rendered":"https:\/\/www.shortform.com\/blog\/?p=87253"},"modified":"2022-12-23T11:45:39","modified_gmt":"2022-12-23T15:45:39","slug":"what-are-dark-matter-and-dark-energy","status":"publish","type":"post","link":"https:\/\/www.shortform.com\/blog\/what-are-dark-matter-and-dark-energy\/","title":{"rendered":"What Are Dark Matter and Dark Energy? Cosmological Placeholders"},"content":{"rendered":"\n<p>What are <a href=\"https:\/\/www.shortform.com\/blog\/neil-degrasse-tyson-dark-matter\/\">dark matter<\/a> and <a href=\"https:\/\/www.shortform.com\/blog\/dark-energy-in-the-universe\/\">dark energy<\/a>? Do our current theories of physics need to be reworked to account for them?<\/p>\n\n\n\n<p>Since humans first looked up, we\u2019ve wondered about our place in the cosmos, yet everything we\u2019ve learned has shown that our ignorance still outstrips our knowledge. Neil deGrasse Tyson explores two of these areas of mystery: dark matter and dark energy.<\/p>\n\n\n\n<p>Read more to find out what we do and don&#8217;t know about these scientific frontiers.<\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\">Dark Matter and Dark Energy<\/h2>\n\n\n\n<p>In addition to expanding what we know about the universe, our deep space observations also reveal that there are major gaps in our understanding of the cosmos. Dark matter and dark energy are two of these gaps. What are dark matter and dark energy? Let&#8217;s take a look at what we know about these mysteries.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Dark Matter<\/h3>\n\n\n\n<p>There appears to be far more gravity in the universe than all the matter we observe can account for. This is the \u201cdark matter\u201d problem. Dark matter\u2019s effects have been known for nearly a century. But, to date, we can tell only what it is <em>not<\/em>, though our observations of the early universe give some tantalizing clues.<\/p>\n\n\n\n<p><strong>85% of the gravitational attraction we measure on the cosmic scale seems to come from invisible sources.<\/strong><\/p>\n\n\n\n<p>To be clear, we don\u2019t know what dark matter is, or even if it\u2019s a form of matter at all. The name \u201cdark matter\u201d is merely a placeholder for something we know is there only because of its effects on what we see. It\u2019s not a bunch of undiscovered black holes; we\u2019d be able to detect them via x-ray emissions. It isn\u2019t massive dark clouds in space; we\u2019d see them blocking the light from behind them. It can\u2019t be planets or asteroids; they\u2019d have to take up <em>six times<\/em> more mass than stars, which Tyson says is exceedingly unlikely. What\u2019s most confusing is that we observe dark matter\u2019s effects only on the largest scale, not on the motion of stars and planets.<\/p>\n\n\n\n<p>We know that dark matter doesn\u2019t fuse with hydrogen and helium. Our best guess is that dark matter consists of an undiscovered type of particle that interacts with others via only gravity, ignoring the other three fundamental forces. Whatever it is, dark matter\u2019s effects show that the so-called \u201cnormal\u201d matter we know is only the tip of the universal iceberg.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">Dark Energy<\/h3>\n\n\n\n<p>As mysterious as dark matter is, it isn\u2019t the biggest puzzle in cosmology. In recent decades, astronomers have witnessed a mysterious force they\u2019ve named \u201cdark energy\u201d that\u2019s accelerating the universe\u2019s expansion. At the moment, we\u2019re ignorant of its true nature.<\/p>\n\n\n\n<p>Tyson traces dark energy\u2019s theoretical roots back to a concept that Einstein thought was a <em>mistake <\/em>in his equations. When Einstein developed general relativity, no one knew that the universe was expanding. To explain why the universe wasn\u2019t collapsing under its own gravity, Einstein included a value in his formulae that he called the \u201ccosmological constant.\u201d It was a placeholder for an unknown force that pushed against the pull of gravity.<\/p>\n\n\n\n<p>By the end of the 20th century, astronomers had established that <strong>the universe is expanding faster than it should be<\/strong>. Now it\u2019s clear that, not only will the expansion continue, but somehow it\u2019s also <em>accelerating<\/em>.&nbsp;<\/p>\n\n\n\n<p>No one understands where the energy comes from that drives the galaxies farther apart, but Tyson writes that there\u2019s already a place for it in relativity\u2019s equations\u2014Einstein\u2019s cosmological constant, which astrophysicists now refer to as \u201cdark energy.\u201d<\/p>\n\n\n\n<p>Even more so than dark matter, Tyson reiterates that we don\u2019t have a clue what dark energy is. However, current estimates suggest that dark energy makes up almost 70% of the universe, with dark matter taking up a little more than 25%, and the regular matter and energy we know of comprising a mere 5% of the observable cosmos.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-the-current-frontier\">The Current Frontier<\/h3>\n\n\n\n<p>Do the existence of dark matter and dark energy mean that our current theories of physics need an overhaul? Perhaps. Tyson posits some current theories: Dark matter could be the gravitational effect of objects in some other dimension. Dark energy could be the result of the spontaneous creation and destruction of subatomic particles in empty space. Whatever the answers turn out to be, <em>not knowing<\/em> is a place where we\u2019ve found ourselves before.<\/p>\n\n\n\n<p>There was a time before we understood fusion, when scientists couldn\u2019t explain how the sun produced light. There was a time before we understood <em>light<\/em>, and scientists believed it traveled through an invisible medium called \u201caether.\u201d There was a time when we thought we were the center of creation, and the stars in the sky were just pretty, twinkling lights. Tyson reminds us that climbing out of ignorance is an adventure and that there will always be something new to discover.<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>An Age of Discovery<\/strong><br><br>Though it\u2019s unlikely we\u2019ll ever explore the stars in the same way as on <em>Star Trek<\/em>, the modern age has been a gold rush of space exploration. There have been many exciting advances in what we\u2019ve learned about the cosmos.<br><br>We\u2019ve discovered <a href=\"https:\/\/www.nasa.gov\/feature\/ames\/ice-confirmed-at-the-moon-s-poles\" target=\"_blank\" rel=\"noreferrer noopener\">ice on the surface of the Moon<\/a> and taken samples of <a href=\"https:\/\/solarsystem.nasa.gov\/stardust\/news\/news108.html\" target=\"_blank\" rel=\"noreferrer noopener\">organic material from a comet<\/a>. We\u2019ve landed a probe on <a href=\"https:\/\/solarsystem.nasa.gov\/missions\/cassini\/mission\/spacecraft\/huygens-probe\/\" target=\"_blank\" rel=\"noreferrer noopener\">Saturn\u2019s moon Titan<\/a> and flown a spacecraft past <a href=\"http:\/\/pluto.jhuapl.edu\/\" target=\"_blank\" rel=\"noreferrer noopener\">distant, icy Pluto<\/a>. The Kepler Space Telescope has identified <a href=\"https:\/\/exoplanets.nasa.gov\/keplerscience\/\" target=\"_blank\" rel=\"noreferrer noopener\">more than 2,600 planets<\/a> outside our solar system, while astronomers using the Event Horizon Telescope took <a href=\"https:\/\/eventhorizontelescope.org\/press-release-april-10-2019-astronomers-capture-first-image-black-hole\" target=\"_blank\" rel=\"noreferrer noopener\">the first picture of a black hole<\/a>.<br><br>At present, there are plans to <a href=\"https:\/\/www.planetary.org\/space-missions\/artemis\" target=\"_blank\" rel=\"noreferrer noopener\">return to the moon<\/a>, bring back <a href=\"https:\/\/www.planetary.org\/space-missions\/mars-sample-return\" target=\"_blank\" rel=\"noreferrer noopener\">soil samples from Mars<\/a>, and take the first direct photographs of <a href=\"https:\/\/www.planetary.org\/space-missions\/roman-space-telescope\" target=\"_blank\" rel=\"noreferrer noopener\">planets outside our solar system<\/a>. However, as Isaac Asimov once said, <a href=\"https:\/\/www.brainyquote.com\/quotes\/isaac_asimov_109758\" target=\"_blank\" rel=\"noreferrer noopener\">the most exciting phrase in science isn\u2019t \u201cEureka!\u201d but \u201cThat\u2019s funny.\u201d<\/a> While it\u2019s guaranteed that we\u2019ll keep making discoveries about the universe, the ones that will truly overturn our ways of thinking are the ones we\u2019ll never see coming.<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>What are dark matter and dark energy? Do our current theories of physics need to be reworked to account for them? Since humans first looked up, we\u2019ve wondered about our place in the cosmos, yet everything we\u2019ve learned has shown that our ignorance still outstrips our knowledge. Neil deGrasse Tyson explores two of these areas of mystery: dark matter and dark energy. Read more to find out what we do and don&#8217;t know about these scientific frontiers.<\/p>\n","protected":false},"author":9,"featured_media":87257,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[160],"tags":[838],"class_list":["post-87253","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-science","tag-astrophysics-for-people-in-a-hurry","","tg-column-two"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v24.3 (Yoast SEO v24.3) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>What Are Dark Matter and Dark Energy? Cosmological Placeholders - Shortform Books<\/title>\n<meta name=\"description\" content=\"What are dark matter and dark energy? Neil deGrasse Tyson shares what we know about two gaps in our understanding of the cosmos. 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