Notes
1 All quotations are taken from the Mars One website <http://www.mars-one.com/> accessed by the author on 1 June 2014. The site invited applications from those wishing to form part of the first human settlement on Mars. At the time of writing, the application process had closed although the selection process was still underway. It is expected that successful applicants will be sent on a one-way trip to Mars within the next few years.