leneenmarshall3495 leneenmarshall3495

11-09-2019
Geography

contestada

Because we live in an expanding universe, distant galaxies are farther away from us today than they were when the light we see from them started on its journey to us. So what do we mean when we say that a galaxy is 7 billion light-years away?

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The1Ghost The1Ghost

11-09-2019

Answer:

There light has taken 7 billion years to reach us.

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