The two most common beliefs of the formation

The two most common beliefs of the formation of the Universe and Solar System
are The Expanding Universe Theory and The Big Bang. There are some comparisons
between the two and some contrasts. Almost all astronomers believe that the
universe is expanding although they may have different theories on how this is
happening. The Expanding Universe Theory is based on the Doppler Effect, the
redshift of different galaxies and the assumption of the Hubble Law. The Doppler
effect occurs when a wave-emmitting object moves toward or away from an observer
and the sound has a change in pitch as the object continues to move. For example
the sound a police car siren when it comes from behind and passes you. The
redshift of different galaxies is the change or shift in the light radiated by
an object such as a star of galaxy that indicates the objects motion. Scientists
have used redshifts to measure the speed and direction of distant galaxies. The
Hubble law showed that the further away the galaxies were the higher the
redshift was, that means the more distant galaxies were moving away at a much
faster velocity than those closer to us. The Expanding Universe theory is merely
an assumption by astronomers that all the galaxies in the universe are moving
away from the earth. The more distant the galaxy the faster its moving away
from us. According to the Big Bang theory a gigantic explosion created the
universe billions of years ago. It appeared that the universe we now see could
be the remnants of an enormous explosion of the distant past.

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