Multiple choice

The average period of Halley's Comet is _______.

  1. 70 years

  2. 72 years

  3. 75 years

  4. 76 years
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Halley's Comet is a short-period comet visible from Earth every 75-76 years. Its average orbital period is approximately 76 years, though it can vary between 74-79 years due to gravitational perturbations from planets. The comet's last appearance was in 1986 and it will return in 2061.

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