The origin of the Universe, with Prof Thomas Hertog
Instant Genius
00:00
The Expansion of the Universe
Einstein's theory of relativity predicts that space must be expanding. If space expands, it means that the distance between galaxies must be expanding as time goes off. And so if you send a signal from one galaxy to another, that signal, in a way, has to catch up with that expansion. A very clear manifestation of the expansion of the universe is that we should see light from distant galaxies - redshift.
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