Comet Hale-Bopp
Comet Hale-Bopp Comet C/1995 O1 (Hale-Bopp) is one of the most famous Oort Clout comets. It came closest to Earth in April 1997 and was visible to the naked for 18 months. Here you can see the comet's gas tail in blue and its dust tail in white. E. Kolmhofer / H. Raab / Johannes Kepler Observatory