Accumulation of particles into a massive object by gravitationally attracting more matter
In astrophysics, accretion is the accumulation of particles into a massive object by gravitationally attracting more matter, typically gaseous matter, into an accretion disk.[1][2] Most astronomical objects, such as galaxies, stars, and planets, are formed by accretion processes.
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eso20080808
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Masters 2010
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