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Black holes have a certain mass, some are only several times the mass of the sun, distributed in smaller galaxies; some are billions of times the mass of the sun, which can be called the real &uot;monster&uot; in the universe.
Orbiting a black hole is like orbiting other massive objects. Gravity is gravity, and orbit is orbit. Because of its strong gravity, supermassive black holes can accrete and move to nearby materials, such as gas, stars and so on.
The accreted material usually has angular momentum,
which will form a rotating accretion disk or a thick accretion current around the black hole. Some of the material will eventually enter the black hole.
Because of the density and strong gravitation of black holes, a lot of gravitational energy will be released in the process of black hole accretion,
which will be converted into the kinetic energy of the material being accreted.
Part of the kinetic energy will be dissipated into the internal energy of gas due to the &uot;friction&uot; between gases or the action of magnetic field.
Black hole accretion is probably the most efficient physical process in the known universe, and its energy conversion rate is dozens of times of that of thermonuclear fusion.
So, a lot of maTTEr in the universe revolves around black holes.
once these &uot;reckless adventurers&uot; are surrounded by the gravity of black holes,
they begin their journey to the end of life. When matter falls into a black hole,
it is often sueezed into a disk called an accretion disk. The disk rotates ceaselessly,
with the release of heat, friction, magnetic energy and electric energy,
- the substances in it emit bright light.
