tenuous: Clouds over Mars, photographed by Mars Express, 6th June 2008.
81°N 248°E to about 24°N 270°E, on the Vastitas Boralis just south of the Rupes Tenuis, a cliff forming part of the edge of the north polar plateau. The dark region in the 2nd image is a small dune sea, and the clouds seen may be high-altitude water-ice clouds.
Drawn from the martian Classical melange, tenuis is a Latin word meaning thin or fine, from whence the English tenuous.
Composite of 5 frames.
Image credit: ESA. Animation: AgeOfDestruction.
They ignore you ‘til they need you.