Frost discovered on Martian volcanoes for the first time

The images show (A) a view of the Ceraunius Tolus volcano taken by NASA’s Mars Reconnaissance Orbiter, with the morning image of CaSSIS visible within the blue rectangle that is enlarged in image (B). The white box in image (B) is enlarged in image (C) and shows spreading frost on the caldera floor, but not on the caldera rim. (D) Shows a CaSSIS image of the same region taken at a different time of day when there was no frost.

The CaSSIS Mars Camera was designed and built by an international team led by Nicholas Thomas from the Institute of Physics at the University of Bern.