{"id":586111,"date":"2026-10-25T19:19:48","date_gmt":"2026-10-25T08:19:48","guid":{"rendered":"https:\/\/science.nasa.gov\/image-article\/apod-2026-october-25-dark-matter-in-a-simulated-universe\/"},"modified":"2026-10-25T19:19:48","modified_gmt":"2026-10-25T08:19:48","slug":"apod-2026-october-25-dark-matter-in-a-simulated-universe","status":"publish","type":"post","link":"https:\/\/www.vibewire.com.au\/?p=586111","title":{"rendered":"APOD: 2026 October 25 \u2013 Dark Matter in a Simulated Universe"},"content":{"rendered":"<div id=\"\" class=\"hds-module hds-module-full alignfull wp-block-nasa-blocks-secondary-navigation\">\n<div class=\"hds-secondary-navigation-wrapper z-top width-100 padding-0\">\n<div id=\"\" class=\"hds-secondary-navigation width-full border-bottom-1px text-center hds-color-mode-dark hds-module hds-module-full alignfull wp-block-nasa-blocks-hdsnav\"><button type=\"button\" class=\"hds-secondary-nav-mobile-button display-flex tablet:display-flex desktop:display-none width-full flex-align-center bg-carbon-90 border-color-carbon-80 color-spacesuit-white\" aria-expanded=\"false\" aria-controls=\"hds-secondary-nav-track\"><span>APOD<\/span><svg width=\"16\" height=\"16\" alt=\"\" enable-background=\"new 0 0 400 400\" viewBox=\"0 0 400 400\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><path d=\"m4.2 122.2 195.1 195.1 196.5-196.6-37.9-38-157.8 157.8-156.8-156.8z\" \/><\/svg><\/button><\/p>\n<div class=\"hds-secondary-nav-track grid-container grid-container-extrawide padding-0 tablet:padding-x-3 desktop:padding-x-2 hds-secondary-navigation-has-breadcrumbs\">\n<div class=\"hds-secondary-navigation-breadcrumbs display-none tablet:display-none desktop:display-flex flex-align-center\">\n<nav class=\"usa-breadcrumb\" aria-label=\"Breadcrumbs\">\n<ol class=\"usa-breadcrumb__list\">\n<li class=\"usa-breadcrumb__list-item\"><a href=\"https:\/\/science.nasa.gov\/\" class=\"usa-breadcrumb__link\" rel=\"noopener\"><span>Science<\/span><\/a><\/li>\n<li class=\"usa-breadcrumb__list-item\"><a href=\"https:\/\/science.nasa.gov\/apod\/apod-index\/\" class=\"usa-breadcrumb__link\" rel=\"noopener\"><span>APOD<\/span><\/a><\/li>\n<li class=\"usa-breadcrumb__list-item usa-current\" aria-current=\"page\"><span>APOD: 2026 October 25 \u2013 Dark\u2026<\/span><\/li>\n<\/ol>\n<\/nav>\n<\/div>\n<div class=\"hds-secondary-navigation-menu-items\">\n<nav>\n<ul class=\"usa-nav__primary usa-accordion flex-justify-center margin-0\">\n<li class=\"usa-nav__primary-item \"><a class=\"usa-nav__link\" href=\"https:\/\/science.nasa.gov\/apod\/\" rel=\"noopener\">Today\u2019s APOD<\/a><\/li>\n<li class=\"usa-nav__primary-item \"><a class=\"usa-nav__link\" href=\"https:\/\/science.nasa.gov\/apod\/archive\/\" rel=\"noopener\">Archive<\/a><\/li>\n<li class=\"usa-nav__primary-item \"><a class=\"usa-nav__link\" href=\"https:\/\/science.nasa.gov\/apod\/submit\/\" rel=\"noopener\">Submissions<\/a><\/li>\n<li class=\"usa-nav__primary-item \"><a class=\"usa-nav__link\" href=\"https:\/\/science.nasa.gov\/apod\/apod-index\/\" rel=\"noopener\">Index<\/a><\/li>\n<li class=\"usa-nav__primary-item \"><a class=\"usa-nav__link\" href=\"https:\/\/science.nasa.gov\/apod\/apod-search\/\" rel=\"noopener\">Search<\/a><\/li>\n<li class=\"usa-nav__primary-item \"><a class=\"usa-nav__link\" href=\"https:\/\/science.nasa.gov\/apod\/apod-calendar\/\" rel=\"noopener\">Calendar<\/a><\/li>\n<li class=\"usa-nav__primary-item \"><a class=\"usa-nav__link\" href=\"https:\/\/science.nasa.gov\/feed\/apod-basic\/\" rel=\"noopener\">RSS<\/a><\/li>\n<li class=\"usa-nav__primary-item \"><a class=\"usa-nav__link\" href=\"https:\/\/science.nasa.gov\/apod\/apod-education\/\" rel=\"noopener\">Education<\/a><\/li>\n<li class=\"usa-nav__primary-item \"><a class=\"usa-nav__link\" href=\"https:\/\/science.nasa.gov\/apod\/apod-about\/\" rel=\"noopener\">About<\/a><\/li>\n<li class=\"usa-nav__primary-item \"><a class=\"usa-nav__link\" href=\"https:\/\/asterisk.apod.com\/discuss_apod.php?date=261025\" rel=\"noopener\">Discuss<\/a><\/li>\n<\/ul>\n<\/nav>\n<\/div>\n<div class=\"hds-secondary-navigation-menu-spacer\">\u00a0<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"\" class=\"hds-media-detail-hero nasa-gb-align-wide width-full maxw-full margin-y-5 desktop:margin-y-7 padding-x-3 media-detail-hero--suppress-inner-media-caption hds-module alignwide wp-block-nasa-blocks-media-detail-hero\">\n<div class=\"grid-container grid-container-block padding-x-0\">\n<p class=\"label margin-bottom-1\">APOD<\/p>\n<p class=\"heading-22 margin-top-0 margin-bottom-2\">Astronomy Picture of the Day<\/p>\n<p class=\"p-md margin-top-0 margin-bottom-3 media-detail-hero__subtext\">\n\t\t\t\t<a href=\"https:\/\/science.nasa.gov\/apod\/archive\/\">Discover the cosmos!<\/a> Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer.\t\t\t<\/p>\n<div class=\"media-detail-hero__media margin-bottom-6\">\n<div id=\"\" class=\"hds-media hds-module wp-block-image\">\n<div class=\"margin-left-auto margin-right-auto nasa-block-align-full\">\n<div class=\"hds-media-wrapper margin-left-auto margin-right-auto\">\n<figure class=\"hds-media-inner hds-cover-wrapper hds-media-ratio-fit \"><a href=\"https:\/\/assets.science.nasa.gov\/content\/dam\/science\/cds\/apod\/apod\/2021\/october\/DarkMatter_KipacAmnh_1200.jpg\"  rel=\"noopener noreferrer\" aria-label=\"The picture shows a computer simulation of the matter distribution in our universe with dark matter shown in a dark color on a light background. Please see the explanation for more detailed information. (opens in a new tab)\"><img decoding=\"async\" width=\"1200\" height=\"900\" src=\"https:\/\/assets.science.nasa.gov\/content\/dam\/science\/cds\/apod\/apod\/2021\/october\/DarkMatter_KipacAmnh_1200.jpg?w=1200&#038;h=900&#038;%23038;fit=clip&#038;%23038;crop=faces%2Cfocalpoint\" class=\"attachment-1200x900 size-1200x900\" alt=\"The picture shows a computer simulation of the matter distribution in our universe with dark matter shown in a dark color on a light background. Please see the explanation for more detailed information.\" style=\"transform: scale(1); transform-origin: 50% 50%; object-position: 50% 50%; object-fit: cover;\" block_context=\"nasa-block\" loading=\"lazy\" srcset=\"https:\/\/assets.science.nasa.gov\/content\/dam\/science\/cds\/apod\/apod\/2021\/october\/DarkMatter_KipacAmnh_1200.jpg?w=1200&#038;h=900&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1200w, https:\/\/assets.science.nasa.gov\/content\/dam\/science\/cds\/apod\/apod\/2021\/october\/DarkMatter_KipacAmnh_1200.jpg?w=300&#038;h=225&#038;fit=crop&#038;crop=faces%2Cfocalpoint 300w, https:\/\/assets.science.nasa.gov\/content\/dam\/science\/cds\/apod\/apod\/2021\/october\/DarkMatter_KipacAmnh_1200.jpg?w=768&#038;h=576&#038;fit=crop&#038;crop=faces%2Cfocalpoint 768w, https:\/\/assets.science.nasa.gov\/content\/dam\/science\/cds\/apod\/apod\/2021\/october\/DarkMatter_KipacAmnh_1200.jpg?w=1024&#038;h=768&#038;fit=crop&#038;crop=faces%2Cfocalpoint 1024w, https:\/\/assets.science.nasa.gov\/content\/dam\/science\/cds\/apod\/apod\/2021\/october\/DarkMatter_KipacAmnh_1200.jpg?w=400&#038;h=300&#038;fit=crop&#038;crop=faces%2Cfocalpoint 400w, https:\/\/assets.science.nasa.gov\/content\/dam\/science\/cds\/apod\/apod\/2021\/october\/DarkMatter_KipacAmnh_1200.jpg?w=600&#038;h=450&#038;fit=crop&#038;crop=faces%2Cfocalpoint 600w, https:\/\/assets.science.nasa.gov\/content\/dam\/science\/cds\/apod\/apod\/2021\/october\/DarkMatter_KipacAmnh_1200.jpg?w=900&#038;h=675&#038;fit=crop&#038;crop=faces%2Cfocalpoint 900w\" sizes=\"auto, (max-width: 85rem) calc(100vw - 3rem), 85rem\" \/><\/a><\/figure>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<h1 class=\"display-48 margin-top-0 margin-bottom-3\">Dark Matter in a Simulated Universe<\/h1>\n<div class=\"grid-row media-detail-hero__content-row\">\n<div class=\"grid-col-12 desktop:grid-col-6\">\n<p class=\"p-md margin-0 media-detail-hero__description\">\n\t\t\t\t\t\t\t<strong>Explanation:<\/strong> Is our universe haunted? It might look that way on this <a href=\"https:\/\/spaceplace.nasa.gov\/dark-matter\/\" rel=\"noopener\">dark matter<\/a> map. The gravity of unseen <a href=\"https:\/\/chandra.harvard.edu\/xray_astro\/dark_matter\/\" rel=\"noopener\">dark matter<\/a> is the leading explanation for why <a href=\"https:\/\/ed.ted.com\/lessons\/dark-matter-how-does-it-explain-a-star-s-speed-don-lincoln\" rel=\"noopener\">galaxies rotate so fast<\/a>, why <a href=\"https:\/\/medium.com\/starts-with-a-bang\/galaxy-clusters-prove-dark-matters-existence-fd962c979458\" rel=\"noopener\">galaxies orbit clusters so fast<\/a>, why gravitational lenses so strongly deflect light, and how <a href=\"https:\/\/science.nasa.gov\/image-article\/apod-2014-may-12-illustris-simulation-of-the-universe\/\" rel=\"noopener\">visible matter<\/a> is distributed. The featured image from the <a href=\"https:\/\/www.amnh.org\/\" rel=\"noopener\">American Museum of Natural History<\/a>\u2018s <a href=\"https:\/\/www.amnh.org\/research\/hayden-planetarium\" rel=\"noopener\">Hayden Planetarium<\/a> Space Show, Dark Universe, highlights one example of how pervasive dark matter might haunt our universe. In this frame from a <a href=\"https:\/\/www.youtube.com\/watch?v=zEEg1XkbXDo\" rel=\"noopener\">detailed computer simulation<\/a>, complex filaments of dark matter, shown in black, are strewn <a href=\"https:\/\/science.nasa.gov\/image-article\/apod-2011-october-3-dark-matter-movie-from-the-bolshoi-simulation\/\" rel=\"noopener\">about the universe<\/a> like <a href=\"https:\/\/www.badspiderbites.com\/giant-spider-web\/\" rel=\"noopener\">spider webs<\/a>, while the relatively rare clumps of familiar <a href=\"https:\/\/en.wikipedia.org\/wiki\/Baryon\" rel=\"noopener\">baryon<\/a>ic matter are colored orange. These simulations are good statistical matches to astronomical observations. In what is perhaps a <a href=\"https:\/\/unsplash.com\/photos\/brown-scottish-fold-in-brown-thick-pile-blanket-NodtnCsLdTE\" rel=\"noopener\">scarier<\/a> turn of events, <a href=\"https:\/\/science.nasa.gov\/dark-matter\/\" rel=\"noopener\">dark matter<\/a> \u2014 although quite strange and in an <a href=\"https:\/\/home.cern\/science\/physics\/dark-matter\" rel=\"noopener\">unknown form<\/a> \u2014 is no longer thought to be the strangest source of <a href=\"https:\/\/ui.adsabs.harvard.edu\/abs\/2008AmJPh..76..265N\/abstract\" rel=\"noopener\">gravity in the universe<\/a>. That honor now falls to <a href=\"https:\/\/science.nasa.gov\/dark-energy\/\" rel=\"noopener\">dark energy<\/a>, a more uniform source of <a href=\"http:\/\/www.preposterousuniverse.com\/blog\/2013\/11\/16\/why-does-dark-energy-make-the-universe-accelerate\/\" rel=\"noopener\">repulsive gravity<\/a> that seems to now dominate the <a href=\"https:\/\/science.nasa.gov\/image-article\/apod-2015-may-31-supernova-1994d-and-the-unexpected-universe\/\" rel=\"noopener\">expansion<\/a> of the entire <a href=\"https:\/\/science.nasa.gov\/apod\/the-nature-of-the-universe-great-debate-in-1998-program\/\" rel=\"noopener\">universe<\/a>.<\/p>\n<p><strong>Tomorrow\u2019s picture:<\/strong> Orion the Great\t\t\t\t\t\t<\/p>\n<\/p>\n<\/div>\n<div class=\"display-none desktop:display-block desktop:grid-col-1\" aria-hidden=\"true\"><\/div>\n<div class=\"grid-col-12 desktop:grid-col-5 margin-top-3 desktop:margin-top-0\">\n<table class=\"media-detail-hero__meta-table width-full\">\n<tbody>\n<tr class=\"media-detail-hero__meta-row\">\n<th scope=\"row\" class=\"label padding-y-1\">Date:<\/th>\n<td class=\"p-sm padding-y-1\">\n\t\t\t\t\t\t\t\t\t\t\t\tOctober 25, 2026\t\t\t\t\t\t\t\t\t\t\t<\/td>\n<\/tr>\n<tr class=\"media-detail-hero__meta-row\">\n<th scope=\"row\" class=\"label padding-y-1\">Credit &#038; Copyright:<\/th>\n<td class=\"p-sm padding-y-1\">\n\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/kipac.stanford.edu\/people\/tom-abel\"  rel=\"noopener\">Tom Abel<\/a> &#038; <a href=\"https:\/\/www.slac.stanford.edu\/~kaehler\/\"  rel=\"noopener\">Ralf Kaehler<\/a> (<a href=\"https:\/\/kipac.stanford.edu\/\"  rel=\"noopener\">KIPAC<\/a> , <a href=\"https:\/\/www6.slac.stanford.edu\/\"  rel=\"noopener\">SLAC<\/a>), <a href=\"https:\/\/www.amnh.org\/\"  rel=\"noopener\">AMNH<\/a>\t\t\t\t\t\t\t\t\t\t\t<\/td>\n<\/tr>\n<tr class=\"media-detail-hero__meta-row\">\n<th scope=\"row\" class=\"label padding-y-1\">Authors &#038; editors:<\/th>\n<td class=\"p-sm padding-y-1\">\n\t\t\t\t\t\t\t\t\t\t\t\tRobert Nemiroff, Jerry Bonnell, Cecilia Chirenti, Keighley Rockcliffe\t\t\t\t\t\t\t\t\t\t\t<\/td>\n<\/tr>\n<tr class=\"media-detail-hero__meta-row\">\n<th scope=\"row\" class=\"label padding-y-1\">A service of:<\/th>\n<td class=\"p-sm padding-y-1\">\n\t\t\t\t\t\t\t\t\t\t\t\t<a href=\"https:\/\/science.gsfc.nasa.gov\/astrophysics\/\"  rel=\"noopener\">ASD<\/a> at <a href=\"https:\/\/www.nasa.gov\/\"  rel=\"noopener\">NASA<\/a> \/ <a href=\"https:\/\/www.nasa.gov\/centers\/goddard\/\"  rel=\"noopener\">GSFC<\/a>,<br \/><a href=\"https:\/\/science.nasa.gov\/learn\/about-science-activation\/\"  rel=\"noopener\">NASA Science Activation<\/a> &#038; <a href=\"https:\/\/www.mtu.edu\/\"  rel=\"noopener\">Michigan Tech. U.<\/a>\t\t\t\t\t\t\t\t\t\t\t<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<div id=\"\" class=\"nasa-gb-align-wide nasa-button-link padding-y-1 padding-x-0 hds-module alignwide wp-block-nasa-blocks-related-link\">\n\t\t\t<a href=\"https:\/\/science.nasa.gov\/apod\/random-apod\/\"  class=\"button-primary button-primary-md link-external-false\" aria-label=\"Random APOD Generator\" rel=\"noopener\"><br \/>\n\t\t\t<span class=\"line-height-alt-1\">Random APOD Generator<\/span><br \/>\n\t\t\t<svg viewBox=\"0 0 32 32\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"><circle class=\"button-primary-circle\" cx=\"16\" cy=\"16\" r=\"16\"><\/circle><path d=\"M8 16.956h12.604l-3.844 4.106 1.252 1.338L24 16l-5.988-6.4-1.252 1.338 3.844 4.106H8v1.912z\" class=\"color-spacesuit-white\"><\/path><\/svg><br \/>\n\t\t<\/a><\/p>\n<\/div>\n<div style=\"height:1px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n<div id=\"\" class=\"hds-module alignwide wp-block-smd-block-next-prev\">\n<div class=\"smd-next-prev-buttons-titles\">\n            <a class=\"smd-next-prev__prev\" href=\"https:\/\/science.nasa.gov\/image-article\/apod-2026-october-24-rosettas-selfie\/\" rel=\"noopener\"><\/p>\n<div class=\"hds-next-prev-nav-arrow hds-next-prev-arrow-prev\">\n                    <svg version=\"1.1\" x=\"0px\" y=\"0px\" width=\"9px\" height=\"9px\" viewBox=\"0 0 9 9\"><path class=\"st0\" d=\"M3.5,4.5l3.7-3.6L6.3,0L1.8,4.5L6.3,9l0.9-0.9L3.5,4.5z\"><\/path><\/svg>\n                <\/div>\n<div class=\"smd-next-prev-buttons-titles__content\">\n<div class=\"smd-next-prev-buttons-titles__prev-label\">\n                        Yesterday&#8217;s Image                    <\/div>\n<div class=\"smd-next-prev-buttons-titles__prev\">\n                        APOD: 2026 October 24 \u2013 Rosetta\u2019s Selfie                    <\/div>\n<\/p>\n<\/div>\n<p>            <\/a><br \/>\n            <a class=\"smd-next-prev__next smd-next-prev__disabled\" href=\"https:\/\/science.nasa.gov\/image-article\/apod-2026-october-25-dark-matter-in-a-simulated-universe\/#\"><\/p>\n<div class=\"smd-next-prev-buttons-titles__content\">\n<div class=\"smd-next-prev-buttons-titles__next-label\">\n                        Tomorrow&#8217;s Image                    <\/div>\n<div class=\"smd-next-prev-buttons-titles__next\">\n                                            <\/div>\n<\/p>\n<\/div>\n<div class=\"hds-next-prev-nav-arrow hds-next-prev-arrow-next\">\n                    <svg version=\"1.1\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" x=\"0px\" y=\"0px\" width=\"9px\" height=\"9px\" viewBox=\"0 0 9 9\"><path class=\"st0\" d=\"M5.5,4.5L1.8,8.1L2.7,9l4.5-4.5L2.7,0L1.8,0.9L5.5,4.5z\"><\/path><\/svg>\n                <\/div>\n<p>            <\/a>\n        <\/div>\n<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>APOD Science APOD APOD: 2026 October 25 \u2013 Dark\u2026 Today\u2019s APOD Archive Submissions Index Search Calendar RSS Education About Discuss \u00a0 APOD Astronomy Picture of the Day Discover the cosmos! Each day a different image or photograph of our fascinating universe is featured, along with a brief explanation written by a professional astronomer. Dark Matter [\u2026]<\/p>\n","protected":false},"author":13,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[20768],"tags":[],"class_list":["post-586111","post","type-post","status-publish","format-standard","hentry","category-apod"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO Pro 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"APOD Science APOD APOD: 2026 October 25 \u2013 Dark\u2026 Today\u2019s APOD Archive Submissions Index Search Calendar RSS Education About Discuss APOD Astronomy Picture of the Day Discover the cosmos! 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