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24 September, 22:46

What does a red shift in light from distant celestial objects indicate to a scientist on earth?

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  1. 25 September, 00:25
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    A red shift in light from a distant source is always assumed to indicate

    that the distant source is moving away from us. That would certainly

    cause it, and we don't know of anything else that would, so it's the only

    way we know to explain it.

    Just about all of modern Cosmology, including the whole idea of the

    expanding universe, is based on that interpretation of the red shift.

    Understand this: That interpretation does explain many things that

    we do see in space, and it predicts things that we do find when we

    look for them. But that does not prove it, and there is no way to prove

    it. So it's perfectly correct to say that it's "only a theory".

    Just like gravity, atoms, and the nature of light.
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