Observations
There are three main sources of evidence that prove the Big Bang theory.
The first is the proving of universal expansion, which was done
by using key observations.
One of these was something as simple as the fact that matter
exists. This proves that there is a dominance of matter over
antimatter in the universe; otherwise matter would not exist,
for a lasting period of time. Rather particles would collide
with its anti-part and become energy.
Another key observation is the time dilations noted in the universe
from the earth. For example, a super nova at a certain distance
decays to half in 10 days. However, to us, since light takes time
to travel, it takes 20 days. 10 days later, when the supernova
has decayed, we do not realize it until more than 20 days. The
universe has expanded in these days. Since the universe is expanding,
light takes longer to reach us.
The final source of evidence is the abundance of hydrogen, which
proves a stage in the Big Bang theory. (More information in the
Subatomic section)
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