NASA’s Mars Expolration Rover turns out to be a robot with a penchant for cloudspotting. In October 2006, during a routine communications pass, it filmed some of the red planet’s clouds and gave us a glimpse at how cloudscapes on Mars compare to those on Earth.
The formation that it photographed looks much like the patches of ice crystals that we call ‘Cirrocumulus’. We have yet to learn the Klingon translation.
See the NASA web page about these martian clouds: