Universe And Solar System
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 it’s 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.