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Δευτέρα 26 Οκτωβρίου 2015

BBC Documentary 2015 | What Happened Before the Big Bang | Documentary ...

                 





BBC Documentary 2015 | What Happened Before the Big Bang |  Documentary ...



Δημοσιεύτηκε στις 2 Οκτ 2015
BBC Documentary 2015 | What Happened Before the Big Bang | Documentary 2015 || Universe Documentary,
The
Big Bang theory is the prevailing cosmological model for the universe
from the earliest known periods through its subsequent large-scale
evolution. The model accounts for the fact that the universe expanded
from a very high density and high temperature state, and offers a
comprehensive explanation for a broad range of observed phenomena,
including the abundance of light elements, the cosmic microwave
background, large scale structure, and Hubble's Law. If the known laws
of physics are extrapolated beyond where they are valid, there is a
singularity. Modern measurements place this moment at approximately 13.8
billion years ago, which is thus considered the age of the universe.
After the initial expansion, the universe cooled sufficiently to allow
the formation of subatomic particles, and later simple atoms. Giant
clouds of these primordial elements later coalesced through gravity to
form stars and galaxies.

Since Georges Lemaître first noted, in
1927, that an expanding universe might be traced back in time to an
originating single point, scientists have built on his idea of cosmic
expansion. While the scientific community was once divided between
supporters of two different expanding universe theories, the Big Bang
and the Steady State theory, accumulated empirical evidence provides
strong support for the former. In 1929, from analysis of galactic
redshifts, Edwin Hubble concluded that galaxies are drifting apart,
important observational evidence consistent with the hypothesis of an
expanding universe. In 1965, the cosmic microwave background radiation
was discovered, which was crucial evidence in favor of the Big Bang
model, since that theory predicted the existence of background radiation
throughout the universe before it was discovered. More recently,
measurements of the redshifts of supernovae indicate that the expansion
of the universe is accelerating, an observation attributed to dark
energy's existence. The known physical laws of nature can be used to
calculate the characteristics of the universe in detail back in time to
an initial state of extreme density and temperature.

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