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Hale–Bopp, one of the most widely observed comets of the 20th century, was independently discovered by astronomers Alan Hale and Thomas Bopp.

Historical image related to Hale–Bopp, one of the most widely observed comets of the 20th century, was independently discovered by astronomers Alan Hale and Thomas Bopp. from July 23, 1995

Comet Hale–Bopp

Great Comet of 1997

Comet Hale–Bopp is a long-period comet that was one of the most widely observed of the 20th century and one of the brightest seen for many decades.
Source: Wikipedia (CC BY-SA)

Alan Hale (astronomer)

Astronomer, co-discoverer of Comet Hale–Bopp (born 1958)

Alan Hale is an American professional astronomer who co-discovered Comet Hale–Bopp independently of its other co-discoverer, Thomas Bopp, an amateur astronomer.
Source: Wikipedia (CC BY-SA)

Thomas Bopp

American astronomer (1949–2018)

Thomas Joel Bopp was an American amateur astronomer. In 1995, he discovered comet Hale–Bopp; Alan Hale discovered it independently at almost the same time, and it was thus named after both of them. At the time of the comet discovery he was a manager at a construction materials…
Source: Wikipedia (CC BY-SA)