The cloud stretching from the Arsia Mons volcano can reach roughly a thousand miles in length during the Martian spring and summer, then dissipate within hours. Researchers are modeling the unusual updrafts and direct condensation of water ice that may make this possible.

Imagine a cloud spanning several U.S. states and appearing on a predictable morning schedule. The atmospheric physics is a good reminder that another planet can behave very differently from Earth.

Action: look at the spacecraft imagery and read the explanation. This is a curiosity detour, not a purchase.