Comet Hale-Bopp Over Val Parola Pass.

Comet Hale-Bopp , the Great Comet of 1997, became much brighter than any surrounding stars. It was seen even over bright city lights . Away from city lights, however, it put on quite a spectacular show . Here Comet Hale-Bopp was photographed above Val Parola Pass in the Dolomite mountains surrounding Cortina d'Ampezzo , Italy . Comet Hale-Bopp 's blue ion tail , consisting of ions from the comet's nucleus , is pushed out by the solar wind . The white dust tail is composed of larger particles of dust from the nucleus driven by the pressure of sunlight, that orbit behind the comet . Observations showed that Comet Hale-Bopp 's nucleus spins about once every 12 hours. A comet that may well exceed Hale-Bopp's peak brightness is expected to fall into the inner Solar System next year.