I saw somewhere a thread about a cow falling into a black hole. I don’t know why a cow, perhaps the OP was thinking about the Milky Way. With the cow example it is not clear to me what we are supposed to see when an object falls towards the event horizon. If time slows to infinity, does the object remain viewable? I don’t understand what is meant in this example, partly because a cow does not emit light. I prefer the following example: A star with 100 solar masses approaches a BH with 10 solar masses, from behind, at high velocity, as seen from the Earth with optical telescopes. What do we see? My guess is that we see the following: - a halo exists round the star (due to lensing) - then a dark point appears in the center of the star - the point grows into a small black disk - the star changes to red and starts to fade - suddenly the black disk disappears and the star becomes as bright as before I am assuming that the velocity of approach is high enough that only a small accretion disk has time to form round the BH. Please tell me what’s wrong with my guesswork. Basically I want to know, can a BH be consumed by a star, so that it is no longer a BH, and what do we see when this happens? What do the relative masses of the star and the BH have to be, in order that the star consumes the BH and not the other way round? Also I would like to understand what we mean by the singularity at the center of a BH. If nearly all the mass of the BH is concentrated in the singularity, presumably we get a gigantic explosion when the singularity expands into ordinary matter? Or if the BH’s mass is relatively small, does the BH just fall into the star pretty quick like a comet into Jupiter?