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Unit Concepts
acceleration crescent full moon lunar nebula reaction force Uranus action force dust clouds galaxy Mars Neptune satellites Venus asteroids Earth gibbous mass new moon solar waning black holes sclipse gravity matter orbit Solar System waxing comet equinox inertia Mercury outer planets solstice weight constellation force inner planets meteorite Pluto stars crater friction Jupiter Milky Way quarter tide
Supporting Links
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last updated: 12/5/00
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