Question

why is Halley's Comet visible from Earth only once every 76 years

Answer 1

Halley's comet will next appear in the night sky in the year 2062. It orbits the sun every 75-76 years, so this is the time between appearances. Halley's comet was recorded by Edmund Halley in 1682. It was seen again in 1758, 1835, 1910, and 1986.

Answer 2

Halley's Comet visible from the Earth only once every 76 years because when this comet come closer to the sun then only it seems to visible which take 76 year.

Explanation:

Comet are huge lumps of ice and dust following their own orbit around the Sun.

The Halley's Comet was last seen in 1968 so,in 2062 it will be seen again.