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Every 76 years or so. The precise orbit is difficult to calculate precisely because the irregular thrust given off by escaping gasses, and by the variance of Halley's passes by the outer planets.

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Q: How often does halleys commet appear?
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How large is halleys commet?

it is 5 miles wide and 9 miles long


Why is halleys commet named halleys commet?

Edmund Halley was the fellow who first realized that the historical accounts of comets seemed to show that they were not solitary events; that they came back into view on a regular schedule. Examining the records, Halley calculated the probable orbit of the comet and concluded that the comet of 1682 was probably the same comet that had been seen in 1607 and before that in 1531. Halley predicted that the comet would once again be visible in 1758. When it was observed in December, 1758, it was dubbed "Halley's Comet", a title it retains.To astronomers, Halley's Comet is called "1P/Halley"; the 1P indicates that in the catalog of comets, this is the first entry and that it is "Periodic".


What size is halleys Comet?

big


Why does halleys comet appear?

Halley's comet appears because it is a comet that orbits the Sun. It as a highly elliptical (oval) orbit which makes it seem to fly out of the solar system and back.


Why does halleys planet appear every 76 years?

Because that's how long its orbit takes just like our orbit around the sun takes 12 months/ a year


Who was Edmund halleys mother?

Anne Robinson


Is halleys comet a star?

No. It's a comet.


What is the orbit of halleys comet?

See related links


What did the spacecraft giotto visit in 1986?

halleys comet


What years will halleys comet be seen?

in 2061 or 2062


What year will Halleys comet come?

early 2062


What is the reason he is famous?

because he discovered halleys comet