What does it mean that the universe is expanding?
March 26, 2025
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0:58Now PlayingWhat does it mean that the universe is expanding?
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as posted by the channelWhen galaxies move away from us, the light they produce stretches and shifts towards the red end of the spectrum. This is called redshift, and its one of the pieces of evidence that tells us our universe is expanding.
One way to visualize this is to think about baking a ball of dough with raisins in it.
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