Hubbles red shift observation wasn't the only thing that he did to support the big bang theory. The big bang theory you also got to see as a theory just like steady state, and they are theory's for a reason, ha, because they haven't been proven. NASA has done a lot of research on the subjects and have substantial evidence pointing towards the fact that Hubble theory is the best for proving the upbringing of time.

For more info please visit:
http://en.wikipedia.org/wiki/Big_Bang

And feel free to ask more about the subject.

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