A comet is a small, icy celestial body whose spectacular tail can be seen from Earth when the comet approaches the sun. Most comets orbit around the Sun in very eccentric, long-period orbits. Others like Halley's Comet, pass close to the Sun more often. Watch a comet transform as it approaches the sun.
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The Moon General Science, Physical Science
The Hubble Space Telescope General Science
The Electromagnetic Spectrum General Science, Physical Science
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