The brightest comet in 20 years is about to make its appearance. Discovered 18 months ago, Comet Hale-Bopp has grown steadily larger and brighter as it approaches the Sun and Earth. It will be numbered among the great comets of our lifetime. Comet Hale-Bopp will be at its best from January to May 1997. It promises to be an outstanding sight, visible anywhere on Earth (although especially fine for the northern hemisphere). For everyone interested in...