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'''Halley's Comet''' (also known as Comet Halley and pronounced to rhym with "valley") is a famous periodic comet which becomes visible to the naked eye when it approaches the Sun, about every 76 years. The last appearance was in 1986 and the next one will be in 2061.

'''Halley's Comet''' (also known as Comet Halley and pronounced to rhyme with "valley") is a famous periodic comet which becomes visible to the naked eye when it approaches the Sun, about every 76 years. The last appearance was in 1986 and the next one will be in 2061.

It is named for astronomer Edmond Halley (1656-1742) who was by no means the "discoverer," in the sense of being the first person to see it, but was the first person to tie together accounts of older comet appearances and realize that these were periodic appearances of ''the same'' comet. This was an important step in astronomers' understanding of comets and the Solar System. (Halley, incidentally, was also a believer in the "hollow earth" theory: that the Earth is a spherical shell and humans live inside, on the inner surface.)

It is named for astronomer Edmond Halley (1656-1742) who was by no means the "discoverer," in the sense of being the first person to see it, but was the first person to tie together accounts of older comet appearances and realize that these were periodic appearances of ''the same'' comet. This was an important step in astronomers' understanding of comets and the Solar System. (Halley, incidentally, was also a believer in the "hollow earth" theory: that the Earth is a spherical shell and humans live inside, on the inner surface.)

The period of 76 years gives Halley's comet an intriguing "once-in-a-lifetime" quality. [[Mark Twain]] was born in 1835, when Halley's Comet was visible, and said "I came in with Halley's Comet and I expect to go out with it." He in fact died in 1910, on Halley's next appearance.

The period of 76 years gives Halley's comet an intriguing "once-in-a-lifetime" quality. [[Mark Twain]] was born in 1835, when Halley's Comet was visible, and said "I came in with Halley's Comet and I expect to go out with it." He in fact died in 1910, on Halley's next appearance.