Halley's Comet is simply an object in orbit around the Sun. The Earth orbits the Sun once per year because it is at just the right distance. Objects further from the Sun take longer to make one orbit. Comets are generally in non-circular orbits that fling them pretty far out of our immediate sight. When they are that far out, they are hard to see. When they get closer, they heat up and become very bright. So, Halley's comet is in an orbit that takes it closer to the Sun every 76 years.
Halley's comet is in orbit around the sun, and the period of the orbit is about 76 years. Whereas the orbits of the planets are nearly circular, the orbit of a comet is eccentric - like a stretched ellipse. Because of this the comet spends most of its time out in deep space out of the plane of the solar system. Every 76 years it gets pulled back in, does a quick slingshot around the sun and goes flying out again. It is when it is near the sun that the comet gets its distinctive tail, for the rest of its time it is just a "dirty snowball".
Answers & Comments
Verified answer
Halley's Comet is simply an object in orbit around the Sun. The Earth orbits the Sun once per year because it is at just the right distance. Objects further from the Sun take longer to make one orbit. Comets are generally in non-circular orbits that fling them pretty far out of our immediate sight. When they are that far out, they are hard to see. When they get closer, they heat up and become very bright. So, Halley's comet is in an orbit that takes it closer to the Sun every 76 years.
Halley Comet Return
Halley's comet is in orbit around the sun, and the period of the orbit is about 76 years. Whereas the orbits of the planets are nearly circular, the orbit of a comet is eccentric - like a stretched ellipse. Because of this the comet spends most of its time out in deep space out of the plane of the solar system. Every 76 years it gets pulled back in, does a quick slingshot around the sun and goes flying out again. It is when it is near the sun that the comet gets its distinctive tail, for the rest of its time it is just a "dirty snowball".
Have a look at the nice animation in the link.
Halleys Comet comes every 76 years is beacuse it doset last long
Beacause it completes its orbit in 76 years.