Comet Halley was last seen passing near the earth 24 years ago. The Comet passes through our inner solar system every 76 years. Comet Halley is called a comet because it’s made of dust and water ice, and when it passes close to the Sun it produces a brilliant tail of dust and ions. Orbital speed depends on how far an object is from the Sun; the closer it is, the faster it moves.
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