day 11 image

It’s the eleventh day of Geekmas and we have 11 zero-gravity fridge rovers to give away. To win, solve this riddle in our Facebook competitions app:

A rover on Mars would steer clear of me,
If they didn’t they would fall deeper than you can see!
I’m a huge canyon of the red planet’s face,
In fact, I’m the biggest of our neighbours in Space.

Good luck!