Despite their name, black holes are often surrounded by bright, radiating whirlpools of matter known as accretion disks — and, typically, the enormous gravity of a black hole can l draw in surrounding gas, or even stars, that send ultra-powerful jets of electromagnetic radiation out into space.
A persistent mystery, however, has been the structure and makeup of black hole coronas — dynamic plasma regions that are part of the flow of matter into the black holes themselves. Similar to the Earth's sun and other stars, a black hole;s corona is essentially a super-heated atmosphere. As NASA states, they can reach temperatures of billions of degrees.
