The conversation between human and AI assistant.
At what speed is the universe expanding? Is it faster or slower than the speed of light?
That's fascinating. How do scientists measure the rate of expansion of the universe?
One way they do this is by observing how light from distant galaxies is shifted towards the red end of the spectrum. This is called redshift and it tells us how fast those galaxies are receding from us, which can give us an overall measure of the universe's expansion rate.