What is accretion as it relates to astronomy?
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In astrophysics, accretion is the accumulation of particles into a massive object by gravitationally attracting more matter, typically gaseous matter, in anaccretion disk. Most astronomical objects, such as galaxies, stars, and planets, are formed by accretion processes.
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Astronomy is a natural science that studies celestial objects and phenomena. It uses mathematics, physics, and chemistry in order to explain their origin and evolution. Objects of interest include planets, moons, stars, nebulae, galaxies, and comets. Wikipedia
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