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Accretion disk
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An accretion disk is a
disk
of
matter
which forms around an object to which it is gravitationaly attracted. The reason the matter forms a disk is that it's
angular momentum
prevents it from falling directly onto the object. The disk experiences internal forces amongst its consituents which heat up the disk and aid in transferring the angular momentum out of the disk and the matter in onto the object. This action of the matter falling, or dripping, slowly in is the accretion. It is usually associated with
binary star
s (one star accreting onto the other), and
black hole
s in the centre of
galaxies
.
printable version
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