The Universe is commonly defined as
the totality of existence, including planets, stars, galaxies, the contents of
intergalactic space, and all matter and energy. Definitions and usage vary and
similar terms include the cosmos, the world and nature.
Scientific observation of the
Universe, the observable part of which is about 93 billion light years in
diameter, has led to inferences of its earlier stages. These observations
suggest that the Universe has been governed by the same physical laws and
constants throughout most of its extent and history. The Big Bang theory is the
prevailing cosmological model that describes the early development of the
Universe, which in physical cosmology is believed to have occurred about 13.77
billion years ago.
There are various multiverse
hypotheses, in which physicists have suggested that the Universe might be one
among many universes that likewise exist. The farthest distance that it is
theoretically possible for humans to see is described as the observable
Universe. Observations have shown that the Universe appears to be expanding at
an accelerating rate, and a number of models have arisen to predict its
ultimate fate.
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