[spindle]

Can you say more about what's wrong about it? It seems plain right to me, in Newtonian physics, assuming only that light has a speed (which was not at all a crazy thing to think at that point), and historians of cosmology usually agree (source personal communication, so I could be wrong).

[mr_toad]

Black holes don’t alter the speed of light, they cause it to follow trajectories that don’t leave the event horizon.

[spindle]

Ah yes - thank you!