why is Halley's Comet visible from the EARTH
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Every 75 years a 15x8km comet enters the inner solar system and becomes visible to the naked eye from Earth. The only known short-period comet that can be seen twice in one lifetime (if observed when very young), its arrival was first predicted by British astronomer Edmond Halley, who calculated that it would appear in 1758. It duly did, though 16 years after his death. Halley also discovered that transits of Mercury and Venus across the sun could be used to calculate the size of the solar system.
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