NASA SVSLike Earth, Mars has polar ice caps. Unlike Earth, the polar ice caps on Mars are a combination of carbon dioxide and water ice. Rather than melting into liquid carbon dioxide, like water ice melts into liquid water, dry ice sublimates directly into carbon dioxide gas when the temperature reaches about -79 degrees C (-110 degrees F). During Martian summer, the carbon dioxide ice undergoes the process of sublimation (solid phase to vapor). Things impact Mars, Earth, and the moon all of the time.

Source: Forbes June 05, 2017 13:30 UTC