How did scientists reach the conclusion that the big bang was the beginning of our universe?
In: Physics
There is light coming back from big objects in the universe, that tells us that those objects are moving away from each other. If you, now, reverse that process in head, you will find that at some point in time they have all been in exactly the same spot.
Imagine you have a balloon and you paint a few dots very close on it. Now you blow air into it and all the dots are moving away from each other but they have been at the same location at the *beginning of time.*
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