Because that's how long its orbit takes just like our orbit around the sun takes 12 months/ a year
Halleys comet comes back around every 76 years.
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.
in 2061 or 2062
True
Halley's Comet is a well-known comet that orbits the Sun approximately every 76 years. It last appeared in 1986 and will next be visible from Earth in 2061.
The planet Uranus. Its year is about 84 of our years.
Comet 46P/Wirtanen is a short-period comet that orbits the Sun every 5.4 years, making it visible from Earth approximately every 11 years. It was last seen in 2018 and is expected to return in 2024.
Every four years as always!
Mercury orbits the sun every 13 years!
Comet Halley was last visible to us in 1997. It only appears about every 75 or 76 years. It is predicted to be visible again on the 28th July 2061.
You will if you live to be 62 or 63 years old.
We don't know exactly. The person who recognized that it was the same comet appearing periodically every 76 years or so was Edmund Halley, but we don't know who was the first to ever see it.