Comet C/1995 O1 Hale-Bopp, on 14 March 1997, showing the slightly curved, white dust tail, and the separated, blue, ion gas tail, pointing away from the Sun. (Photo: ESO/E. Slawik)

Comet C/1995 O1 Hale-Bopp, on 14 March 1997, showing the slightly curved, white dust tail, and the separated, blue, ion gas tail, pointing away from the Sun. (Photo: ESO/E. Slawik)