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Dictionary

plan'etary preces'sion

Astron.
the small component of the precession of the equinoxes contributed by the motion of the ecliptic, the change in orientation of the plane of the earth's orbit being produced by the gravitational attraction of the planets.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

planetary nebula

planetesimal

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