HALE OBSERVATORIES / SCIENCE PHOTO LIBRARY HALE OBSERVATORIES / SCIENCE PHOTO LIBRARY
Two views of Halley's comet, May 12 and 15, 1910, showing tails 30 degrees and 40 degrees long respectively. Photographed with a 10-inch focus Tessar lens. 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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