Science Enhanced Scope & Sequence Grade 6

comet. A small object (10–25 km in diameter) composed of dust and frozen gases and in orbit around the sun. Comets are found at great distances from the sun (beyond the dwarf planet Pluto) in stable orbits or in long, elliptical orbits passing near the sun. A comet’s tail is caused by evaporation of the surface of the comet by the heat of ... ................
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