Dark Energy, Dark Matter

  • The universe is full of matter and the attractive force of gravity pulls all matter together.
  • a long time ago, the universe was actually expanding more slowly than it is today
  • So the expansion of the universe has not been slowing due to gravity, as everyone thought, it has been accelerating
  • Dark Matter is a form of matter thought to account for approximately 85% of the matter in the universe and about a quarter of its total energy density.
  • Dark Energy is an unknown form of energy which is hypothesized to permeate all of space, tending to accelerate the expansion of the universe
  • It turns out that roughly 68% of the universe is dark energy.
  • Dark matter makes up about 27%.
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