宇宙以光速膨胀吗？ChatGPT 的回答

The expansion of the universe is not characterized by a singular speed like the speed of light. Instead, it's described by the Hubble constant, which is a measure of how fast the universe is expanding in relation to distance. Distant galaxies are moving away from us at speeds proportional to their distances, meaning the farther away a galaxy is, the faster it appears to be receding from us.

This expansion speed can exceed the speed of light for sufficiently distant galaxies. However, this doesn't violate the theory of relativity, which states that nothing can travel through space faster than light. The key here is that the galaxies themselves are not moving through space at these high speeds; rather, it is the space between galaxies that is expanding.