Halley's Comet or Comet Halley (/Ëhaeli/ ËhÃ¦li /or/), ËheÉªli officially DESIGNATED/1p, halley is a-short period comet visible From earth everyâ75 76. Years halley is the only known-short period comet that is clearly visible to the naked eye From, earth and the only-naked eye comet that might appear twice in a human. lifetimehe perihelion, the point in the comet's orbit when it is nearest the Sun, is just 0.6 AU. This is between the orbits of Mercury and Venus. Its aphelion, or farthest distance from the Sun, is 35 AU (roughly the distance of Pluto).
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