SpaceYoung Saturn gave Jupiter the building blocks for its big moons After Jupiter formed, it likely had no nearby material to build moons. Young Saturn may have tossed rocks at the gas giant that grew into its four biggest moons ¿ìè¶ÌÊÓÆµ
SpaceDwarf planet Ceres has a water cycle but it’s not like Earth’s Ceres, a distant dwarf planet, hosts sheets of ice just under its surface. In the summer, some of this ice may sublimate and coat shadowy crater walls in frost ¿ìè¶ÌÊÓÆµ