Learn about the asteroids and comets in our solar system. Learn about the composition and orbit of comets as well as the history of their discovery famous comets and space missions to analyze them. This causes another notable difference between asteroids and comets this forms a glowing halo that extends outward from the comet as it sails through space. What is a comet a comet is a very small solar system body made mostly of ices mixed with smaller amounts of dust and rock most comets are no larger than a few kilometres across. List of minor planets and comets visited by spacecraft three asteroids have been imaged by spacecraft at distances too large to resolve comet space probe
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