Comet Hale-Bopp
Comet Hale-Bopp. Hale-Bopp was one of the brightest comets of the 20th century, and was seen for much of early 1997. A comet is a lump of ice and rock that shines by reflected sunlight. Its tail is formed as the ice evaporates as it nears the Sun. The tail always points away from the Sun, and may stretch for millions of kilometres.
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