how often does halley's comet come

Halley’s Comet returns to the inner solar system roughly every 75–76 years, though its orbit actually ranges from about 74 to 79 years between appearances. It was last seen in 1986 and is expected back around the year 2061.

Quick Scoop

• Average return time: About every 75–76 years, making it a once- or twice-in-a-lifetime visitor for most people.

• Actual orbital range: Astronomers calculate its period as roughly 74–79 years because the gravity of planets slightly tweaks its path each time.

• Last appearance: 1986, when spacecraft from several space agencies flew by it for close-up study.

• Next appearance: Predicted for mid‑2061, when it should again be visible from Earth with the naked eye under good conditions.

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