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Comet Hale-Bopp

Comet Hale-Bopp was probably the most widely observed comet of the 20th century, and one of the brightest seen for many decades.

It was visible to the naked eye for a record 18 months, twice as long as the previous record holder, the Great Comet of 1811.

Note:   The above text is excerpted from the Wikipedia article "Comet Hale-Bopp", which has been released under the GNU Free Documentation License.
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