If light has no mass, how is it affected by black holes?

The answer is:  massive objects bend the "fabric" of space-time, so light travels along a different path than it would have if the massive object were not there.

[🎞️physicsgene]
https://t.co/08wznSPeuc

Common misconception.

Newtonian gravity (no spacetime) *also* allows a massless particle to be affected by gravity: in 1801, von Soldner calculated the trajectories of such particles by taking limits as M-&gt;0.

Interestingly, the deflection is exactly half that predicted by GR.

Jonathan Gorard

TIL

https://x.com/getjonwithit/status/1915401219947852151