Observable universe
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The observable universe consists of the galaxies and other matter that can, in principle, be observed from Earth in the present day because light (or other signals) from those objects has had time to reach the Earth since the beginning of the cosmological expansion. Assuming the universe is isotropic, the distance to the edge of the observable universe is roughly the same in every direction. That is, the observable universe is a spherical volume (a ball) centered on the observer, regardless of the shape of the universe as a whole. Every location in the universe has its own observable universe, which may or may not overlap with the one centered on Earth.
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See also
- Big Bang
- Bolshoi Cosmological Simulation
- Causality (physics)
- Chronology of the universe
- Dark flow
- Event horizon of the universe
- Hubble volume
- Multiverse
- Orders of magnitude (length)
- Timeline of the Big Bang
Unless indicated otherwise, the text in this article is either based on Wikipedia article "Observable universe" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on research by Jahsonic and friends. See Art and Popular Culture's copyright notice.
