Water frost on Mars: On the top of immense volcanoes, a briefly icy landscape

The formation of water frost is common on Earth, especially in winter when atmospheric water vapor condenses and freezes on the surface. On Mars, the atmosphere is about 100 times less dense than on Earth, but it too contains water vapor. The atmosphere on Mars contains 10,000 times less water vapor than on our planet, however, so icing is less likely.