Hollows are typically clusters of rimless depressions with flat floors and haloes of bright (high albedo) material surrounding them.
Hollows are thought to form by loss of volatiles from the surface by sublimation, caused by the intense solar radiation on the airless planet.
[2] The MESSENGER spacecraft imaged the rest of the planet, much of it at higher resolution and in color, leading to the discovery of hollows and clues about their formation and nature.
Other craters where hollows are present include Warhol, Xiao Zhao, Seuss, Wergeland, Raditladi, Sholem Aleichem, Lermontov, Darío, and Scarlatti.
Kertész, Sander, Sontag, Nāwahī, and Balanchine are craters with hollows within the Caloris basin.