🔋college physics i – introduction review

key term - Flat (zero curvature) universe

Definition

A flat (zero curvature) universe is a cosmological model in which the geometry of space is Euclidean, meaning it has no overall curvature. This implies that parallel lines never meet, and the angles of a triangle add up to 180 degrees.

5 Must Know Facts For Your Next Test

  1. A flat universe indicates that the total density of matter and energy is exactly equal to the critical density.
  2. The concept of a flat universe arises from solutions to Einstein's field equations in General Relativity.
  3. Cosmic Microwave Background (CMB) measurements support the hypothesis that our universe is very close to being flat.
  4. In a flat universe, the expansion rate will slow down over time but will never completely halt.
  5. Observations suggest dark matter and dark energy contribute significantly to making the universe flat.

Review Questions

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