# Big Bang at every point in space?

## Main Question or Discussion Point

How does a Big Bang occur at every point in space. It is easy to comprehend something exploding at a point and sending everything outwards, but if something explodes (if we are even talking about the Universe exploding) at every point on and in itself, wouldn't it blow itself up or something, because every point is exploding then they would keep each other from expanding into each other and rather outwards. Seems like I just answered myself. Nevertheless, any thoughts?

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Originally posted by Nibles
How does a Big Bang occur at every point in space. It is easy to comprehend something exploding at a point and sending everything outwards, but if something explodes (if we are even talking about the Universe exploding) at every point on and in itself, wouldn't it blow itself up or something,
The Big Bang wasn't an explosion of anything, it was an expansion of space.

In the balloon analogy, picture space as the surface of the balloon (not the interior, the surface), with all the matter as dots sprinkled over its surface. Run it back in time, so the balloon shrinks. The dots get closer and closer together. At the "Big Bang", the balloon has completely shrunk to zero size, and all the dots (all the locations in space) are at the same place.

Or, picture an infinite plane with a uniform grid of dots in it. (They're really randomly spaced, but it's easier to picture a uniform grid). The dots are the galaxies and such. Now, half the distance between each dot: you get an infinite grid of points again, but they're denser. Keep doing that. In the limit, you have an infinite plane which is completely black, filled with an infinitely dense collection of dots. The Big Bang refers to the state that space was in, in this infinitely-dense condition: there is no particular location or dot that is the center of it all.

Phobos
Staff Emeritus