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buy cheap ativan online Comets, on the other hand, are less-frequent visitors from the outer solar system. They are often called dirty snowballs and are believed to act as time capsules from the deep freeze of the solar system, containing the primary dust and gases from which everything we can touch and smell began. Comets glow and produce a tail of gas and dust when they pass through the inner solar system because the sun’s heat causes frozen gases within them to sublime. Their orbit is different to that of asteroids, being generally more elliptical.