by APOD Robot » Tue Oct 31, 2017 4:11 am
Dark Matter in a Simulated Universe
Explanation: Is our universe haunted? It might look that way on this
dark matter map. The gravity of unseen
dark matter is the leading explanation for why
galaxies rotate so fast, why
galaxies orbit clusters so fast, why
gravitational lenses so strongly deflect light, and why
visible matter is distributed as it is both
in the local universe and
on the cosmic microwave background. The featured image from the
American Museum of Natural History's
Hayden Planetarium Space Show
Dark Universe highlights one example of how pervasive dark matter might haunt our universe. In this frame from a
detailed computer simulation, complex filaments of dark matter, shown in black, are strewn
about the universe like
spider webs, while the relatively rare clumps of familiar
baryonic matter are colored orange.
These simulations are good statistical matches to astronomical observations. In what is perhaps a scarier turn of events,
dark matter -- although quite strange and in an
unknown form -- is no longer thought to be the strangest source of
gravity in the universe. That honor now falls to
dark energy, a more uniform source of
repulsive gravity that seems to now dominate the expansion of the entire universe.
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[url=https://apod.nasa.gov/apod/ap171031.html][img]https://apod.nasa.gov/apod/calendar/S_171031.jpg[/img] [size=150]Dark Matter in a Simulated Universe[/size][/url]
[b] Explanation: [/b] Is our universe haunted? It might look that way on this [url=https://www.nasa.gov/audience/forstudents/9-12/features/what-is-dark-matter.html]dark matter[/url] map. The gravity of unseen [url=http://chandra.harvard.edu/xray_astro/dark_matter/]dark matter[/url] is the leading explanation for why [url=http://ircamera.as.arizona.edu/NatSci102/NatSci/lectures/darkmatter.htm]galaxies rotate so fast[/url], why [url=https://medium.com/starts-with-a-bang/galaxy-clusters-prove-dark-matters-existence-fd962c979458]galaxies orbit clusters so fast[/url], why [url=https://www.lsst.org/sites/default/files/img/xxnyt.jpg]gravitational lenses so strongly deflect light[/url], and why [url=https://apod.nasa.gov/apod/ap140512.html]visible matter[/url] is distributed as it is both [url=http://w.astro.berkeley.edu/~mwhite/models.html]in the local universe[/url] and [url=http://background.uchicago.edu/~whu/intermediate/driving2.html]on the cosmic[/url] [url=https://apod.nasa.gov/apod/ap130325.html]microwave background[/url]. The featured image from the [url=https://www.amnh.org/]American Museum of Natural History[/url]'s [url=https://www.amnh.org/our-research/hayden-planetarium]Hayden Planetarium[/url] Space Show [url=https://www.amnh.org/exhibitions/space-show/dark-universe/]Dark Universe[/url] highlights one example of how pervasive dark matter might haunt our universe. In this frame from a [url=https://www.youtube.com/watch?v=zEEg1XkbXDo]detailed computer simulation[/url], complex filaments of dark matter, shown in black, are strewn [url=https://apod.nasa.gov/apod/ap111003.html]about the universe[/url] like [url=https://www.badspiderbites.com/giant-spider-web/]spider webs[/url], while the relatively rare clumps of familiar [url=https://en.wikipedia.org/wiki/Baryon]baryon[/url]ic matter are colored orange. [url=https://www.slac.stanford.edu/~kaehler/homepage/visualizations/dark-matter.html]These simulations[/url] are good statistical matches to astronomical observations. In what is perhaps a scarier turn of events, [url=https://en.wikipedia.org/wiki/Dark_matter]dark matter[/url] -- although quite strange and in an [url=https://home.cern/about/physics/dark-matter]unknown form[/url] -- is no longer thought to be the strangest source of [url=http://adsabs.harvard.edu/abs/2008AmJPh..76..265N]gravity in the universe[/url]. That honor now falls to [url=https://science.nasa.gov/astrophysics/focus-areas/what-is-dark-energy]dark energy[/url], a more uniform source of [url=http://www.preposterousuniverse.com/blog/2013/11/16/why-does-dark-energy-make-the-universe-accelerate/]repulsive gravity[/url] that seems to now dominate the expansion of the entire universe.
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