Hollows on Mercury: MESSENGER Evidence for Geologically Recent Volatile-Related Activity.

The article presents research on depressions in the deposits in impact craters on the planet Mercury. The authors used high-resolution images taken by the MESSENGER spacecraft to examine both the depressions and host rocks associated with crater central peaks, walls, and floors. They conclude that the hollows were most like formed by a loss of volatile materials due to processes such as pyroclastic volcanism, sublimation, and space weathering. Photographs of hollows on Mercury in craters including the Sander crater, the Tyagaraja crater, and the Praxiteles crater are provided.