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Asked by shaniqua to Mike, Pip, Tianfu, Tim, Tom on 27 Jun 2012.
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Tom Lister answered on 27 Jun 2012:
It has been observed that all of the stars and galaxies that we can see seem to be moving away from us and the further away they are, the faster they seem to be going. This would be the case if us and them were all on the surface of an expanding sphere. If we go back in time, the sphere gets smaller until all of the universe is at a single point – this time we think of as the big bang – just as it all exploded out of that point.
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Tim Stephens answered on 27 Jun 2012:
Yup. It’s an idea that Astronomers have to explain the fact that all the stars in the universe seem to be moving away from each other (and us).
Comments
stinley commented on :
there is also cosmic background radiation which is low level micro-wave radiation left over from the big bang.