... The Earth has once again endured a burst of particles from the Sun. ... Europa's Ice Rafts . ... The surface of Jupiter's moon Europa has shifted. Photographs released yesterday of Europa's surface taken by the spacecraft Galileo show that the smooth moon's icy surface is sometimes like a giant scrambled jigsaw puzzle. Pieces of Europa's surface, identifiable above, have rafted to new locations. ... Comet Hale-Bopp Over New York City . ... Does a comet's dust tail always orbit behind it? ...