{"id":87240,"date":"2022-12-16T18:53:00","date_gmt":"2022-12-16T22:53:00","guid":{"rendered":"https:\/\/www.shortform.com\/blog\/?p=87240"},"modified":"2022-12-23T11:45:42","modified_gmt":"2022-12-23T15:45:42","slug":"neil-degrasse-tyson-dark-matter","status":"publish","type":"post","link":"https:\/\/www.shortform.com\/blog\/neil-degrasse-tyson-dark-matter\/","title":{"rendered":"Neil deGrasse Tyson: Dark Matter &#038; the Missing Mass Problem"},"content":{"rendered":"\n<p>What&#8217;s dark matter? Could it be undiscovered black holes or even planets?<\/p>\n\n\n\n<p>We can&#8217;t see wind, but we know it&#8217;s there because of its effects on things we can see. That&#8217;s how it is with dark matter. In 1937, astronomers observed galaxies moving around as a result of a huge mass they couldn&#8217;t see. This \u201cmissing mass\u201d problem gave rise to the concept of dark matter.<\/p>\n\n\n\n<p>According to Neil deGrasse Tyson, dark matter is a mystery that raises fascinating questions. Continue reading to learn what dark matter is not and what it might be.<\/p>\n\n\n\n<!--more-->\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-dark-matter-missing-mass\">Dark Matter &amp; Missing Mass<\/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. According to Neil deGrasse Tyson, dark matter is one of these problems.<\/p>\n\n\n\n<p>There appears to be far more gravity in the universe than all the matter we observe can account for. 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<figure class=\"wp-block-table\"><table><tbody><tr><td><strong>A Primer on Gravity<\/strong><br><br>To understand the problem dark matter poses, it\u2019s important to know the basics of gravity. It was first defined by Isaac Newton as <a href=\"https:\/\/www.amnh.org\/explore\/videos\/space\/gravity-making-waves\/newton-einstein-gravity\" target=\"_blank\" rel=\"noreferrer noopener\">the force by which any two objects with mass attract each other<\/a>. For instance, just as Earth\u2019s gravity exerts a pull on the mass of your body, your body also exerts a pull on the Earth. Newton couldn\u2019t explain <em>how <\/em>this force works between objects that aren\u2019t touching each other, such as the Earth and its moon, but <a href=\"https:\/\/www.physicsclassroom.com\/class\/circles\/Lesson-3\/Newton-s-Law-of-Universal-Gravitation\" target=\"_blank\" rel=\"noreferrer noopener\">he formulated a law that predicted exactly how much force objects exert on each other<\/a>.<br><br>The next breakthrough was made by Albert Einstein, who was able to solve the problem Newton couldn\u2019t. Einstein proposed that <a href=\"https:\/\/www.discovermagazine.com\/the-sciences\/how-to-understand-einsteins-theory-of-gravity\" target=\"_blank\" rel=\"noreferrer noopener\">objects with mass bend space and time around them<\/a>, and that gravitational attraction is the observable effect of the \u201cdent\u201d that objects with mass make in space. Einstein\u2019s theory made several predictions that wouldn\u2019t hold true under Newton\u2019s theory, such as that <a href=\"https:\/\/esahubble.org\/wordbank\/gravitational-lensing\/\" target=\"_blank\" rel=\"noreferrer noopener\">gravity bends rays of light<\/a> or that cataclysmic stellar events might create <a href=\"https:\/\/spaceplace.nasa.gov\/gravitational-waves\/en\/\" target=\"_blank\" rel=\"noreferrer noopener\">gravitational waves, as observed in 2015<\/a>. However, because of dark matter, the light from distant galaxies is bent more than it would be by the visible objects in its path.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The discrepancy between gravity and observable mass isn\u2019t trivial. Tyson asserts that Einstein\u2019s expansion of Newton\u2019s gravity equation has passed every practical and experimental test, yet <strong>85% of the gravitational attraction we measure on the cosmic scale seems to come from invisible sources.<\/strong> This \u201cmissing mass\u201d problem was first discovered in 1937 when astronomers plotting the motion of galaxies in clusters found them moving as if acted upon by a giant mass that wasn\u2019t there. Since then, the same observations have been made even within individual galaxies.<\/p>\n\n\n\n<p>(Shortform note: Unfortunately, it\u2019s hard to put a galaxy on a scale to weigh it. Astronomers measure the mass of a galaxy <a href=\"https:\/\/www.sciencedaily.com\/releases\/2018\/06\/180606173803.htm\" target=\"_blank\" rel=\"noreferrer noopener\">by observing the motion of smaller galaxies and stars that orbit it<\/a>. Using this method, we\u2019ve been able to compute that <a href=\"https:\/\/www.cfa.harvard.edu\/news\/mass-milky-way\" target=\"_blank\" rel=\"noreferrer noopener\">our own Milky Way galaxy is 1-2 <em>trillion <\/em>times as massive as our sun<\/a>. However, according to our best estimates, <a href=\"https:\/\/www.space.com\/41312-gaia-mission.html\" target=\"_blank\" rel=\"noreferrer noopener\">there are \u201conly\u201d about 200 billion stars in the Milky way<\/a>, the majority of which are smaller than our sun, <a href=\"https:\/\/public.nrao.edu\/ask\/how-much-dark-matter-does-the-milky-way-contain\/\" target=\"_blank\" rel=\"noreferrer noopener\">leaving 90% of the galaxy\u2019s mass unaccounted for<\/a>.)<\/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. None of our space probes have ever gone off course because of the pull of a dark matter object.<\/p>\n\n\n\n<p>(Shortform note: It may not be true for much longer that dark matter\u2019s effects can\u2019t be observed within the solar system. NASA scientist Jim Green and mathematician Edward Belbruno have calculated that the probes we\u2019ve sent the farthest into space, such as Voyagers 1 and 2, <a href=\"https:\/\/academic.oup.com\/mnras\/article\/510\/4\/5154\/6496049\" target=\"_blank\" rel=\"noreferrer noopener\">may have been pulled minutely off course<\/a> by the presence of dark matter in the solar system. They propose that <a href=\"https:\/\/www.nasa.gov\/feature\/how-dark-matter-could-be-measured-in-the-solar-system\" target=\"_blank\" rel=\"noreferrer noopener\">a probe with highly sensitive equipment may be able to measure this divergence<\/a> if sent out to 100 times the distance from the Earth to the sun.)<\/p>\n\n\n\n<p>According to Tyson, our observations of the early universe give us some insight into the dark matter problem. We know that dark matter doesn\u2019t fuse with hydrogen and helium\u2014if it did, the proportion of those elements would be different from what we observe. However, it could be that dark matter is responsible for the \u201clumpy\u201d nature of the early universe. If so, <strong>without dark matter\u2019s gravitational influence, the stars and galaxies may never have formed.<\/strong> 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<p>(Shortform note: In the absence of direct observation, <a href=\"https:\/\/scitechdaily.com\/physicists-have-developed-a-method-for-predicting-the-composition-of-dark-matter\/\" target=\"_blank\" rel=\"noreferrer noopener\">scientists create mathematical models to predict the hypothetical effects of dark matter<\/a>, which astronomers can then search for in the universe. For example, one such model proposed that dark matter particles created in the Big Bang may have had an equivalent mass to protons and neutrons. However, the same model shows that the small dark matter particles would have interfered with the formation of light elements, such as hydrogen and helium. Models that predict a different universe than we actually observe are unlikely to be accepted as viable theories.)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What&#8217;s dark matter? Could it be undiscovered black holes or even planets? We can&#8217;t see wind, but we know it&#8217;s there because of its effects on things we can see. That&#8217;s how it is with dark matter. In 1937, astronomers observed galaxies moving around as a result of a huge mass they couldn&#8217;t see. This \u201cmissing mass\u201d problem gave rise to the concept of dark matter. According to Neil deGrasse Tyson, dark matter is a mystery that raises fascinating questions. Continue reading to learn what dark matter is not and what it might be.<\/p>\n","protected":false},"author":9,"featured_media":87244,"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-87240","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>Neil deGrasse Tyson: Dark Matter &amp; the Missing Mass Problem - Shortform Books<\/title>\n<meta name=\"description\" content=\"According to Neil deGrasse Tyson, dark matter raises big questions. 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