While the Martian clouds may look like the kind seen in Earth’s skies, they include frozen carbon dioxide, or dry ice.
NASA’s Curiosity Mars rover captured these drifting noctilucent, or twilight, clouds in a 16-minute recording on Jan. 17. The white plumes falling out of the clouds are carbon dioxide ice that would evaporate closer to the Martian surface.
Martian clouds are made of either water ice or, at higher altitudes and lower temperatures, carbon dioxide ice. The latter are the only kind of clouds observed at Mars producing iridescence, and they can be seen near the top of the new images at an altitude of around 37 to 50 miles . They’re also visible as white plumes falling through the atmosphere, traveling as low as 31 miles above the surface before evaporating because of rising temperatures.
Jet Propulsion Laboratory Mars Mars Science Laboratory (MSL) Radioisotope Power Systems (RPS)
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