A rotating disk of gas, dust, and other matter that forms around a massive body such as a black hole, neutron star, or young star. The material spirals inward due to gravitational forces and friction, often emitting intense radiation. Accretion disks are among the most luminous objects in the universe.
A region of spacetime where gravity is so strong that nothing, not even light, can escape once past the event horizon. B...
The collapsed core of a massive star after a supernova, with 1.4-2 solar masses in a sphere about 20 km across. Incredib...
An extremely luminous active galactic nucleus powered by a supermassive black hole. Quasars can outshine entire galaxies...
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