This lunar soil marks the last time humans visited another world. It was here in December 1972 that the final Apollo astronauts walked on the Moon. This image is a solemn reminder of our space explorations past and (hopefully) future.
This was taken last month by the Lunar Reconnaissance Orbiter, and it's the sharpest image ever taken of the Apollo 17 landing site. The LRO also snapped similarly high-res shots of the Apollo 12 and Apollo 14 landing sites. Apollo 17 was the last of the six successful Apollo missions - and NASA would again like to stress that there definitely were no secret returns to the Moon or anything stupid like that - and it spent three days from December 11 to 13, 1972 in the Moon's Taurus-Littrow Valley.