Hints: quasar galaxy gravitational pull

This ferocious heart of brilliant hot gas is called a quasar. Scientists thought this whirling mass might be caused by a giant black hole sucking up gas and stars, literally feeding on the center of a galaxy.
The idea is that the quasars that we see that look so bright are not the black hole, the supermassive black hole. They are the gas that's just about to fall into the supermassive black hole, that's going around it, shining very brightly just before it disappears down into the black hole.
A giant black hole would have a gravitational pull so overwhelming, it would hurl gas and stars around it at almost the speed of light. The violent clashing would heat the gas up to over a million degrees.
The gas rubs against itself essentially and gets extremely hot, and extremely hot gas shines very brightly.

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