Dark matter universe | Proceedings of the National Academy of Sciences thumbnail
Dark matter universe | Proceedings of the National Academy of Sciences
www.pnas.org
ost of the mass in the universe is in the form of dark matter The evidence for the existence of dark matter through its gravitational impact is clear in astronomical observations—from the early observations of the large motions of galaxies in clusters and the motions of stars and gas in galaxies, to
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  • ost of the mass in the universe is in the form of dark matter
  • The evidence for the existence of dark matter through its gravitational impact is clear in astronomical observations—from the early observations of the large motions of galaxies in clusters and the motions of stars and gas in galaxies, to observations of the large-scale structure in the universe, gravitational lensing, and the cosmic microwave back...
  • The data inform us that the dark matter is nonbaryonic, is “cold” (i.e., moves nonrelativistically in the early universe), and interacts only weakly with matter other than by gravity

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