I'm going out on a limb here: unlike Earth, Mars is not mostly 'armless.
Curiosity rover RENDERED ARMLESS by short circuit
Humanity's Mars-resident nuclear-powered, laser-packing space tank Curiosity has a broken arm. NASA boffins said the problem emerged on 27 February when "the rover was conducting an early step in the transfer of rock powder collected by the drill on the arm to laboratory instruments inside the rover." During that operation " …
COMMENTS
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Wednesday 4th March 2015 14:08 GMT Ugotta B. Kiddingme
Oh, THAT explains it...
this picture, taken right before the arm short circuit, might explain a thing or two. Anyone seen my spare Illudium Q36 Explosive Space Modulator?
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Wednesday 4th March 2015 17:28 GMT I ain't Spartacus
We all know the real reason, despite the NASA cover-up. As they've improved the capacity of the deep space network, they are now able to get video to Mars. The rover has been watching too much material of an 'artistic' nature - and obviously the wear-and-tear on the arm wasn't factored into a design that didn't expect high-grade porn to be accessible.
As to what porn a 2 tonne laser-armed space tank watches, I leave that as an exercise for the reader's imagination...