What is the key idea behind the Big Bang theory?

Correct answer: Universe expanding

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What people think about it: 3 Comments
Jonesy
Jonesy
That Cøunt, Ray Bumpkin, my theory is that the universe is like a 3D rubber band expanding in all directions until it has reached its limits and then retracts, until there is another big bang. So the cycle never ends. Another theory I have is that there are multiple universes, just like the suds in a bubble bath. Each one of those bubbles is a universe. Just a theory.... Ever seen the end credits for the 1st Men in Black.
That Cøunt, Ray Bumpkin
That Cøunt, Ray Bumpkin
Hey all. Thanks for the comments, they are very interesting.
That Cøunt, Ray Bumpkin
That Cøunt, Ray Bumpkin
What defines the boundaries of the universe? Is it simply the farthest objects? Are there other universes, also expanding? Will they eventually overlap?