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

If you think of the big bang as an explosion everything that was in the big bang when it was “set off” is still in the universe so in a way everything in the universe was at the centre of the expansion. To tell the “real” centre of the explosion you would need to observe the universe from the outside.

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