Halley's Comet is visible from Earth approximately every how many years?
A
50
B
75
C
76
D
100
Correct Answer: Option C — 76
Explanation:
Halley's Comet has an orbital period of approximately 75 to 76 years and is the most well-known short-period comet. It last appeared in 1986...
Halley's Comet has an orbital period of approximately 75 to 76 years and is the most well-known short-period comet. It last appeared in 1986 and is expected to return in 2061. Named after astronomer Edmond Halley who first calculated its periodic orbit it has been observed for thousands of years.