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Prepare to take your humor back to fifth grade, space nerds.
One of NASA's Mars exploration rovers was wheeling around our next-door planet neighbor when a quick spin and thrust left wheel tracks that resembled a, ummm, errr ... penis.
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Redditor aggrazel, who shared the image on Tuesday, astutely summed up the naughty doodle: "Mars Rover = $800m, Team to Operate = $1b. Drawing a penis on the surface of another planet = Priceless."
The image has made the rounds online, leaving the Red Planet red faced. Somewhere, Uranus got a good laugh.
BONUS: The 10 Most Stunning Images of Mars in History
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