Hale Bopp comet and observatories. These observatories are on the summit of Mauna Kea, Hawaii, USA. From left to right they are: Subaru Telescope, Kec

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Hale Bopp comet and observatories. These observatories are on the summit of Mauna Kea, Hawaii, USA. From left to right they are: Subaru Telescope, Keck 1 and Keck 2 telescopes, and NASA Infrared Telescope Facility. Hale Bopp was discovered on 23rd July 1995. It was visible to the naked eye for over 18 months between May 1996 and December 1997.

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Photo credit: © DAVID NUNUK/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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