Hydrazine
Could they not have put that spacesuit in a bag? Or inside another spacesuit?
Why were they voting? Was there no captain? That Asian guy seemed to be the captain.
Why were six people going on a manned mission to another planet and not planning to go outside on the surface?
Why was no one on the orbital ship? to react to unexpected events. What if something unexpected happened like say it was attacked by fairy lights, wouldn't it be good to have someone up there just in case?
Why were these astronauts so shook up by loosing a crew member? Aren't astronauts meant to be pretty tough? Aren't they pretty well tested before they go on these missions, to react well in stressful situations?