Mars Rover Curiosity 'draws' penis on surface of Red Planet The Mars Rover has drawn a penis with its tyre tracks. IT'S the most expensive robot in the world, but it seems the Mars Rover has the mind of an eight-year-old schoolboy. And like any bored schoolboy the $800 million machine is now passing the hours by drawing crude pictures of the male anatomy. A photo of Curiosity's track patterns has sent millions into a titter for its likeness to a penis. The photo went viral after it was posted on Reddit with the caption "Mars Rover = $800M, Team to Operate = $1B. Drawing a penis on the surface of another planet = Priceless. The Curiosity rover has drilled into a rock on Mars for testing using its onboard laboratories Curiosity landed on Mars last year to explore the planet for any signs of life. It is controlled by a team of NASA engineers who send instructions to the six-wheeled machine each day. A self-portrait of NASA's Mars rover Curiosity.