If the need arises, they can get back on earth in two days time or so. I also think/guess their major health risks are of the “you die immediately” kind, not of

If the need arises, they can get back on earth in two days time or so. I also think/guess their major health risks are of the “you die immediately” kind, not of the “it helps a lot of you get to a hospital within x minutes” kind.