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Comets are familiar to nearly everyone as majestic, starlike objects with long tails stretching across a wide band of the sky. The most famous comet, Halley’s comet, makes its periodic return to the night skies every seventy-five years. The word comet is derived from a Greek word meaning “long-haired.” Comets were once greatly feared as bad omens, but they have since been identified and cataloged as objects that come into the inner solar system from deep space. Most of them occupy orbits... więcej
Salem Press Encyclopedia of Science, 2023. 3p.
A comet is a celestial body made of frozen ice, rock, and dust that orbits the sun. Because of its composition, a comet is often called a "dirty snowball." Scientists believe that comets were created during the formation of our solar system about 4.6 billion years ago in either the Kuiper Belt or the Oort Cloud regions. A comet has three parts: a nucleus, a coma, and a tail. The frozen body of a comet is called the nucleus.
Salem Press Encyclopedia of Science, 2022. 2p.
