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.
Types
of active galaxies
Four types of active
galaxies: quasars, blazers, radio galaxies and Sifter galaxies. Quasars and blazers
are the most distant objects and higher energy known. They are billions of
light years from Earth. We see them as they were in the past, when galaxies
were still forming. They are the brightest objects in the universe, but are so
far away that their light reaches us faintly. Almost all known active galaxies
are quasars.
The radio galaxies and Sifter
galaxies are objects nearby and very bright. Emit X-rays, infrared radiation
and radio waves. Its radiation is so great that the main source of radio waves
across the Cosmos.
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