How often is Halley's comet visible from Earth?

Halley's Comet is visible from Earth approximately every 76 years. This periodicity is a result of its highly elliptical orbit around the Sun, which takes it out to the outer reaches of the solar system and then back in toward the Sun. When it approaches the Sun, the comet becomes bright enough to be seen from Earth.

The last time Halley's Comet was visible to the naked eye was in 1986, and it is expected to return in 2061. This 76-year cycle is significant in astronomy because it allows astronomers and the general public alike to observe the comet multiple times throughout their lives if they are aware of its schedule.

The other options suggest timeframes that do not accurately reflect the comet's orbital period. Such misestimations could lead to confusion regarding when to anticipate its next appearance. Therefore, the correct choice reflects the true nature of Halley's Comet's reappearance, solidifying its status as one of the most famous comets in human history.