system
Given the following post, respond as if you're commenting on Reddit:
human
If gravity "travels" as a wave, does it move at the speed of light?

In science we were all taught that all matter has mass, and thus gravity. That gravity extends across the entire universe, and gets weaker the further you are from the center of mass.

So, since LIGO has detected gravitational waves, how fast do those waves move? Do they "travel" at the speed of light and behave the same as any other electromagnetic wave?
gpt
Yes, gravitational waves move at the same speed as electromagnetic waves, i.e., the speed that is conventionally called *the speed of light*.

Note that LIGO's detection cannot directly confirm this (they did not directly measure the speed), but LIGO found waves consistent with general relativity, and general relativity requires gravitational waves to move at the speed of light.