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physical object > natural object > celestial body > natural satellite > Themis
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Themis comparison table
Subject is part of is a kind of is an instance of has definition
natural satellite satellite Body orbiting a planet. Since 1957 the term has also been applied to man-made (artificial) satellites; many astronomers make the distinction by calling natural satellites moons (and the Earth's natural satellite the Moon).
ThemisSaturn natural satelliteA satellite of Saturn discovered by Pickering in 1900, but since lost.

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