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 is like literature, a continuing dialog among diverse and conflicting voices, no one ever wholly right or wholly wrong, but a steady conversation forever provisional and personal and living.Gregory Benford
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