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Stars and the Universe
What is the Big Bang?
"big bang" is the most widely accepted
explaining how the Universe began.
theory suggests that a long time ago (about
the Universe started as a big explosion. All the energy
and matter which exists today came from this original explosion.
evidence for this theory comes from two
1. Light from stars in other galaxies is red-shifted.
2. There is cosmic microwave background radiation (CMBR)
everywhere in space.
don't need to be able to explain the CMBR,
just know that it exists.
Clever scientists did some mathematical calculations
on what would have happened in the big bang.
Their calculations showed that there should be
a low level of microwave radiation as a result of the
original explosion. When they looked out into space they
found this background microwave radiation everywhere.
The big bang is the only theory which explains the CMBR.
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