Halley's Comet, photographed March 19, 1986, showing plasma (lower) and dust (upper) tails. Halley is the only naked-eye comet certain to return within a human lifetime (every 75 year or so). It derives its name from Edmond Halley, an eighteenth-century astronomer who computed its orbit. The comet has been observed by astronomers since at least 240 BC.
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