An almost perfectly round rock on the surface of Mars Photo: NASA
By Mark Molloy
Being stuck millions of miles from home on a barren planet might seem like a lonely existence, but not for Nasa’s Curiosity rover.
Our favourite roving robot is yet to find any aliens on Mars, but its touristy snaps of the Red Planet have kept us entertained.
Curiosity has been exploring the Red Plant for over two years now and has stayed in touch by sending back regular photo updates.
The latest photographs show what appears to be an almost perfectly round ball on the planet’s dusty surface.
Unfortunately, it hasn't been left by Martians with a passion for sport, there is a much simpler explanation.
The sedimentary rock is a lot smaller than it appears in the picture, just 1cm wide, and is leftover from when lake and rivers flowed on the planet.
This week, Curiosity drilled into the base of Mount Sharp and collected a powdered rock sample.
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