What does it mean that the universe is expanding?

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Is stuff getting bigger? Is empty space appearing making everything further apart? Why isn’t there a definable center, isn’t everything going away from a point?

ETA: thank you so much for the explanations. I think this might be one I can’t get my head around without some more work, but I really appreciate all the help!!

In: Physics

4 Answers

Anonymous 0 Comments

Everything is moving away from everything else. There’s no center because there is no central point where everything is moving away from. Imagine drawing dots on a balloon and blowing up the balloon. The *surface* of the balloon represents the universe in that analogy. The surface of the balloon doesn’t have a center, all that dots are just moving away from all the other dots.

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