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Enlace: http://www.pbs.org/wgbh/nova/spacewatch/

Descripción: PBS NOVA Online.
«The image of Comet Hale-Bopp blazing across the night sky of 1997 has delighted casual stargazers and astronomers alike. It was first spotted in July 1995 by Alan Hale and Thomas Bopp, who observed it the same night in neighboring states (New Mexico and Arizona, respectively). Astronomers immediately became excited about the comet because it appeared to be unusually bright -- even when it was still well outside Jupiter's orbit.»