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Showing posts with label quasars. Show all posts
Showing posts with label quasars. Show all posts

Sunday, June 10, 2012

Every galaxy has a black hole


Every galaxy has black holes at their center. While the black hole is active, traps and swallows all matter around it, like a whirlpool. When he is not able to swallow again, the matter continues to revolve around him, but not within. The galaxies whose black hole is still active called active galaxies.
Active galaxies are famous by their shape and the large whole of radiation they emanate. The black hole core is surrounded by a bright disc of matter, dust and hot gas. It is called the accretion disk, and spirals while emitting high energy radiation. Since the poles, the black hole space launches huge jets of particles, which can measure thousands of light years in length. The Milky Way galaxy was also active in the past.