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The dwarf planet Ceres is known to host a considerable amount of water in its interior, and areas of water ice were
detected by the Dawn spacecraft on its surface. Moreover, sporadic water and hydroxyl emissions have been observed
from space telescopes. We report the detection of water ice in a mid-latitude crater and its unexpected variation
with time. The Dawn spectrometer data show a change of water ice signatures over a period of 6 months,
which is well modeled as ~2-km2 increase of water ice. The observed increase, coupled with Ceres’ orbital parameters,
points to an ongoing process that seems correlated with solar flux. The reported variation on Ceres’ surface
indicates that this body is chemically and physically active at the present time.