You may be forgiven for having missed the news of NASA's Curiosity rover, or Mars Science Laboratory (MSL), having landed on Mars, given all the coverage the 2012 Olympics had been getting.

To try and even this up, we got in touch with Dr. Leila Battison, a palaeontologist from the University of Oxford, UK, who is currently working at NASA, researching the earliest life in the fossil record and the conditions it needed to survive. We discussed NASA's mission to Mars and explored what kind of things we could expect from any signs of life on another planet based on what we know about early life on Earth from the fossil record.