Question

What is the average period of orbit of Halley’s Comet?
a) 22 years
b) 18 years
c) 76 years
d) 100 years

Answer 1

Halley's comet will next appear in the night sky in the year 2062. It orbits the sun every75-76 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.