Crescent asteroid
After Rosetta passed Lutetia, its cameras were pointed back to the rock, and therefore back toward the inner solar system. That geometry gives us an amazing, brooding, and lovely view we never get from Earth: a crescent asteroid.

Credit: ESA 2010 MPS for OSIRIS Team. MPS/UPD/LAM/IAA/RSSD/INTA/UPM/DASP/IDA