Comet storm split destiny of Jupiter's twin moons

IT IS a tale of two moons, sent on different paths by a traumatic event. Jupiter’s two biggest moons – apparently close kin – are in fact quite different inside. Heavy pummelling by icy comets could solve the mystery. At first glance, Ganymede (pictured) and Callisto are twins. The moons are similar in size, mass, and overall composition. Ganymede, though, has a solid rock core surrounded by a thick layer of ice, while Callisto has a mixture. Amy Barr and Robin Canup of the Southwest Research Institute in Boulder, Colorado, think they know why:
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