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Active galaxies are the most powerful objects in the Universe - they are
often as bright as a million million suns. It is generally accepted that
active galaxies are primarily powered by material which falls onto a central,
supermassive black hole. This image shows a "cut-away" diagram of what we
now think the central engine of such a galaxy looks like; the red is the
in-falling matter and the blue is a jet thrown out by the black hole, which
is in the centre. For more information on active galaxies, see our AGN and QSOs page.
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