Until recently it was thought that comets were bodies residues formed by cosmic sky, very similar to meteorites, wandering aimlessly through the solar system. Today our understanding of comets have undergone a revolution. The American astronomer Fred Whipple has formulated a hypothesis that fits perfectly with most astronomical observations. According to Whipple, comets are like "dirty snowballs", ie would be formed by a conglomerate of ices (water, ammonia, carbon dioxide) and solid grains composed of carbon and silicates.
nuclei and compounds, due to its small size, lightweight and compact, they are able to resist the gravitational pull of Sun and planets, but al the same time are quite volatile to justify ia huge cloud of which are surrounded by the effect of solar heat. This hypothesis would also explain why comets are not visible when hair and no tail.
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