Asteroid Fast Facts - NASA
https://www.nasa.gov/solar-system/asteroids/asteroid-fast-facts/
WEBMar 31, 2014 · Asteroid: A relatively small, inactive, rocky body orbiting the Sun. Comet: A relatively small, at times active, object whose ices can vaporize in sunlight forming an atmosphere (coma) of dust and gas and, sometimes, a tail of dust and/or gas. Meteoroid: A small particle from a comet or asteroid orbiting the Sun.
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