Comet Hale–Bopp (formally designated C/1995 O1) is a comet that was perhaps the most widely observed of the 20th century, and one of the brightest seen for many decades.
Hale-Bopp kuyruklu yıldızı (C/1995 O1) büyük bir olasılıkla yirminci yüzyılın en çok gözlemlenmiş kuyruklu yıldızıdır.