Is There a Black Hole in the Universe?

We know that at the end of a star's lifetime, it can explane into us and then collapse into a black hole. It is looking like you kind of need those massive first stars to collapse in that way. And so this is a way of kind of skipping a stage of growth, which would then explain the supermassive black holes at the central spiral galaxies. Can we tell? No, black holes don't come with an identity cart. They are very difficult to pin down because they swallow pretty much every piece of information. But we can kind of say, well, how can they have got that massive? How are ther're so many?