.Ever since the big bang, our universe has been expanding.
We know this thanks to the astronomer Edwin Hubble, who measured the
speed at which other galaxies are moving away from us. In 1929, Hubble
determined that the farther a galaxy is from us, the faster it is moving away.
The universe is expanding in all directions. It’s not that the universe is expanding within space. Space itself is expanding. But into what?
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