MarkWhittington writes: 2015 was a historical year for NASA with its close flyby of the dwarf planet Pluto last July. But the space agency rings out the year with some close looks at two divergent worlds thanks to its far-ranging space probes. The Dawn mission returned the closest images yet of the dwarf planet Ceres, the largest body in the asteroid belt. Also, the space agency released images of Saturn's icy moon Enceladus, whose ice geysers have fascinated scientists, indicating a subsurface ocean similar to the one that resides beneath the ice moon of Jupiter, Europa.
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