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Comprehensive
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albedo the degree to which a planet, asteroid, or the like reflects light. [1/2 definitions]
asteroid a small, rocky, planet-like body that circles the sun and is mostly found between the orbits of Jupiter and Mars. The size of an asteroid can vary from very tiny to six hundred miles across.
celestial body a natural object found outside earth's atmosphere, such as a planet, moon, star, or asteroid.
Ceres the largest asteroid and the first one discovered. [1/2 definitions]
planetoid an asteroid.