what is not known to us about black hole
Answers
Stellar black holes form when the center of a very massive star collapses in upon itself. This collapse also causes a supernova, or an exploding star, that blasts part of the star into space. Scientists think supermassive black holes formed at the same time as the galaxy they are in.
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Answer:
The black hole is approx 55 million light years away, how was its existence known and how was it pictured with just telescopes?
Prajval Shastri: The existence of this black hole was first guessed at because the Messier87 galaxy when imaged at radio frequencies shows the signature twin-jets of plasma that are squirted out at near-relativistic speeds to reach well beyond the galaxy into intergalactic space. Furthermore, studying the movement of gas clouds in the central region shows gas moving at enormous speeds both towards and away from us, and these speeds are consistent with the hypothesis that the gravitational force of a central billion-solar mass black hole drives this gas. Matter in the close vicinity of a black hole shines because it gets extremely hot, and light from “behind” the black hole also reaches us because the gravitational field of the black hole bends this light towards us. The black hole can thus be seen in silhouette against the shining surrounding matter, if one has telescopes with sharp enough vision, which the Event Horizon Telescope had.