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Halley's Comet, if it is a typical comet, was created during or shortly after the formation of the solar system, some 4.6 billion years ago. Although it may have originally had a very elliptical (long-period) orbit, the current (short-period) orbit may have been established between 10,000 and 200,000 years ago.

It has been observed from Earth since about 240 BC (about 2250 years) and last appeared in the inner solar system in February, 1986.

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7y ago

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