The universe is constantly expanding, but how do scientists think about what it’s expanding into?

The expansion of the universe is, in some ways, similar. But this analogy gets one thing wrong – while the dough expands into the baking pan, the universe doesn’t have anything to expand into ...

Because the universe’s size is already infinite, its size can’t increase. So essentially, if the universe is of infinite magnitude, it cannot possibly be expanding into anything.

What is the universe expanding into if it’s already infinite? – Mael, age 10, Missoula, Montana When you bake a loaf of bread or a batch of muffins, you put the dough into a pan.

If the universe is expanding, then what does it expand into? This question was originally answered on Quora by Richard Muller.

The universe is expanding, but what is it expanding into? (Part 2) Perhaps the universe isn’t expanding say our readers, whose heads are hurting at the implications of its infinite nature ...

If the Universe's expansion isn't constant, what does that mean for the future of things in our Universe? What is it that triggers this expansion in the first place?

Cosmic expansion stretches space itself, as if space were made of some kind of stretchy rubber material; there is no physical border, only stretching space, says astrophysicist Marcelo Gleiser.