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Ceres

The pockmarked face of Ceres: once asteroid, now dwarf planet, imaged by Dawn in 2015.
The pockmarked face of Ceres: once asteroid, now dwarf planet, imaged by Dawn in 2015. Image: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Ceres is gargantuan as far as asteroids go, making up 25% of the asteroid belt between Mars and Jupiter all by itself. In fact, Ceres is now classified as a dwarf planet and was visited by the spacecraft Dawn in 2015. That trip gave researchers fantastic imagery of the spherical object, one that still has water—making it a particularly intriguing candidate for life.