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planetary
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Planetary science encompasses the study of planets, moons, and other celestial bodies within our solar system.
Planetary geology investigates the surfaces and interiors of planets and moons.
Planetary astronomers once thought the apparent motions of Mars could be explained by a combination of deferents and epicycloids modeled after circular trajectories.
Nebular hypotheses propose various mechanisms for the formation of planetary systems.
Interstellar gas clouds are the birthplaces of new stars and planetary systems.
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