NASA space geeks have been caught with their pants down after a lewd image appeared on the surface of MARS.

The rude drawing has emerged in a series of images taken by one of its Rover machines.

The $2.5 billion Curiosity rover robot probe landed on Mars in August last year and is meant to be used to examine the red planet’s surface in search of life.

PHOTOS: MARS – THE RED PLANET

The Curiosity Rover has built up a huge fanbase with its own Twitter account with thousands of followers.

It regularly updates its social media page with snapshots from deep space.

The original image went viral after Reddit users discovered the cheeky photo.

To read more, go to The Sun.