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Why Does the Universe Expand?

82 points · 77 comments · the__alchemist

  1. BoiledCabbage · · focus · HN ↗
    Because our universe is actually the inside of a blackhole.

    <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Black_hole_cosmology#Evidence" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Black_hole_cosmology#Evidence

    1. cryptonector · · focus · HN ↗
      Not so. You can have high enough mass-energy density and yet not a black hole because the momenta are all outward -- dynamics details matter.
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