The big bang!

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Scientists believe the Universe began in a hot 'big bang' about 13,600 million years ago. The Universe continues to expand today. The evidence for the Big Bang theory includes the existence of a microwave background radiation, and red-shift. Stars do not remain the same, but change as they age.

The Big Bang theory

Scientists have gathered a lot of evidence and information about the Universe. They have used their observations to develop a theory called the Big Bang. The theory states that about 13.7 billion years ago all the matter in the Universe was concentrated into a single incredibly tiny point. This began to enlarge rapidly in a hot explosion, and it is still expanding today.

Evidence for the Big Bang includes:

all the galaxies are moving away from usthe further away a galaxy is, the faster it is moving away.

These two features are found in explosions - the fastest moving objects end up furthest away from the explosion.

Scientists have also detected a cosmic microwave background radiation or CMBR. This is received from all parts of the Universe and is thought to be the heat left over from the original explosion.

Tip from Hilter:

It's NOT THE SHOW!

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