On a related note, there has been an interesting episode of BBC's CrowdScience. They reported that robots which go to Mars (to find out about microbial life) ha

On a related note, there has been an interesting episode of BBC's CrowdScience. They reported that robots which go to Mars (to find out about microbial life) have to go through an extreme cleaning process to make sure that they contaminate Mars as little as possible with microbial life from our planet . http://www.bbc.co.uk/programmes/p04nmxzl http://www.bbc.co.uk/programmes/p04nmxzl