A comet is a small celestial body gravitating around a star on a very elliptical orbit (unlike the asteroids). During its travel, it approaches very close to the star and, under the solar wind effect, adorns with a luminous trail – the tail – which makes it sometimes visible to the naked eye.
Science fiction may be defined as that branch of literature which deals with the response of human beings to advances in science and technology.Isaac Asimov
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