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What do we mean when we say that the universe is expanding?

a: on average, distances between the galaxies are increasing.

b: average distances are increasing between stars within galaxies.

c: individual galaxies are gradually growing in size.

d: everything in the universe is gradually growing in size.

e: the statement is not meant to be literal; rather, it means that our knowledge of the universe is growing

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What do we mean when we say that the universe is expanding?

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