The Story Of The Universe : Big Bang, Space-time, And The Relativity The...
Δημοσιεύτηκε στις 13 Δεκ 2014
The
Universe is all of spacetime and everything that exists therein,
including all planets, stars, galaxies, the contents of intergalactic
space, the smallest subatomic particles, and all matter and
energy.[1][2][3][4][5][6] Similar terms include the cosmos, the world,
reality, and nature.
The estimated diameter of the observable
universe is about 93 billion light years or 28 billion parsecs.[7]
Scientific observation of the Universe has led to inferences of its
earlier stages, which appear to have 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 is estimated to have begun
13.798 ± 0.037 billion years ago.[8][9]
Scientists remain unsure
about what, if anything, preceded the Big Bang. Many refuse to
speculate, doubting that any information from any such prior state could
ever be accessible.[citation needed] There are various multiverse
hypotheses, in which some physicists have suggested that the Universe
might be one among many, or even an infinite number, of universes that
likewise exist.[10][11]
The universe is composed of 4.9 percent
atomic matter, 26.6 percent dark matter and 68.5 percent dark energy[12]
Observations of supernovae have shown that the Universe is expanding at
an accelerating rate.[13] There are several competing theories about
the ultimate fate of the universe.
Universe is all of spacetime and everything that exists therein,
including all planets, stars, galaxies, the contents of intergalactic
space, the smallest subatomic particles, and all matter and
energy.[1][2][3][4][5][6] Similar terms include the cosmos, the world,
reality, and nature.
The estimated diameter of the observable
universe is about 93 billion light years or 28 billion parsecs.[7]
Scientific observation of the Universe has led to inferences of its
earlier stages, which appear to have 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 is estimated to have begun
13.798 ± 0.037 billion years ago.[8][9]
Scientists remain unsure
about what, if anything, preceded the Big Bang. Many refuse to
speculate, doubting that any information from any such prior state could
ever be accessible.[citation needed] There are various multiverse
hypotheses, in which some physicists have suggested that the Universe
might be one among many, or even an infinite number, of universes that
likewise exist.[10][11]
The universe is composed of 4.9 percent
atomic matter, 26.6 percent dark matter and 68.5 percent dark energy[12]
Observations of supernovae have shown that the Universe is expanding at
an accelerating rate.[13] There are several competing theories about
the ultimate fate of the universe.
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