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2011 June
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Picture of the day
Trails of
Martian
dust devils
, which appear as dark streaks on the light surface, as seen by
Mars Reconnaissance Orbiter
. Dust devils are strong, well-formed, and relatively long-lived
whirlwinds
that can form when hot air near the surface rises quickly through a small pocket of cooler,
low-pressure
air above it. On Mars, dust devils have unexpectedly cleaned the
solar panels
of the
Mars rovers
.
Photo:
NASA
/
JPL
/
University of Arizona
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