What are Active Galaxies?
An active galaxy emits up to thousands of times more energy than a normal galaxy. Most of this energy is released not in visible light but in other wavelengths, from radio waves to gamma rays. In addition, long jets of gas can spew forth from the galaxy at nearly the speed of light. This activity is driven by a supermassive black hole in the galaxy’s nucleus.
Keywords: Astrophysics, Active galaxies, Force and energy, Galaxies, Black holes (Astronomy)
This kinetic model illustrates the accretion disk around a black hole.