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There are several dozen known periodic comets, and we have observed many long-period comets as well. New ones are discovered every year. In fact, a new comet was discovered last fall, and should be nicely visible in the spring.

If you are referring to Halley's Comet, it was last seen in 1910 and then in 1986, and is expected to be back around in 2061 or so. However, observations of Halley's Comet go back to the 3rd century BC. Check the Related Links below for more info.

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16y ago

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