If The Universe Is Expanding What Is It Expanding Into

The definition of the universe is that it contains everything.

However if you just want a short answer i ll say this. Also the bug universe is curved. That represents the expansion of the universe even though the galaxies aren t moving. The analogy implies that there s a surrounding space a third dimension into which the bug universe expands.

That model universe is two dimensional but in our mind s eye we immediately think of it expanding into a third dimension a dimension that the ants can t access because they can t jump. The universe doesn t need to be expanding into anything greater than itself. But it could be doing much much more. The expanding universe is due to gravity which means that in regions of high density the dominant gravitational effects are entirely local.

The universe is everything so it isn t expanding into anything. That question doesn t make sense. He explains this mind bending idea to bbc earth s michael. As a case in point not all galaxies are moving away.

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The recent discovery of accelerated. Instead what is happening is that every region of the universe every distance between every pair of galaxies is being stretched but the overall size of the universe was infinitely big to begin with and continues to remain infinitely big as time goes on so the universe s size doesn t change and therefore it doesn t expand into. The short answer is that this is a nonsense question the universe isn t expanding into anything it s just expanding. All of the galaxies in the universe are moving away from each other and every region of space is being stretched but there s no center they re expanding from and no outer edge to expand into anything else.

If the universe is infinitely big then the answer is simply that it isn t expanding into anything. In the big bang theory it is the metric tensor which is changing. It may simply be expanding because that s what space does in general relativity.