system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: If it is said that the gravitational pull of Black Holes is so strong that it attracts light, then wouldn't that require light to have mass?
gpt
Light always travels in a straight line relative to space-time.  Since a black hole creates a massive curvature in space-time, the light follows the curve of space-time (but is still going straight).  From an outside observe, it appears that light bends towards the black hole; in reality, light's not bending - space-time is.