system
Given the following post, respond as if you're commenting on Reddit:
human
Does light have its own gravity?

Light has no mass and is affected by gravity, I was just wondering if it had any gravity of its own?
gpt
Yes, in the Einstein field equations, the gravity (spacetime curvature) is related not to the mass, but the stress-energy-momentum tensor which is non-0 even for massless stuff like light. So spacetime gets bent.