Weightlessness
Mission Commander James Campbell: "One thing that may surprise you - it may even disappoint you - but it makes our life easier - is that you are unlikely to experience weightlessness.
"On this mission you will be skirting the earth's atmosphere, high enough to reach orbit, but still within the reach of earth's gravitational pull.
"Full training and acclimatization to the zero-gravity environment takes 12 months - which we haven't got."