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Universe
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Physical cosmology
Universe · Big Bang
Age of the universe
Timeline of the Big Bang
Ultimate fate of the universe
Inflation · Nucleosynthesis
GWB · Neutrino background
Cosmic microwave background
Redshift · Hubble's law
Metric expansion of space
Friedmann equations
FLRW metric
Shape of the universe
Structure formation
Reionization
Galaxy formation
Large-scale structure
Galaxy filament
Lambda-CDM model
Dark energy · Dark matter
Dark fluid · Dark flow
Timeline of cosmological theories
Future of an expanding universe
Observational cosmology
2dF · SDSS
COBE · BOOMERanG · WMAP · Planck
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The Universe is commonly defined as the totality of everything that exists, including all matter and energy, the planets, stars, galaxies, and the contents of intergalactic space. Definitions and usage vary and similar terms include the cosmos, the world and nature. Scientific observation of earlier stages in the development of the Universe, which can be seen at great distances, suggests that the Universe has been governed by the same physical laws and constants throughout most of its extent and history. There are various multiverse theories, in which physicists have suggested that our universe is one among many universes that likewise exist.
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