Volunteers can stay for a minimum of two weeks and a maximum of eight, and will need the hard work to burn off the big, fire-side dinners, including game stroganoff and local stews served with millpap, a mashed potato-like maize.
The 13-tonne mission was initially lifted into a 350km-high orbit above Earth, with the expectation that the probe's big engine would fire twice - first, to raise that orbit, and, second, to set course for Mars.