Party leadership knows Trump is bad for them, so they will not support him.
Rank and file appear to have more Trump supporters than Harris (or Biden prior to the switch.)
Therefore the teamsters feel that they’re screwed if they endorse either one.
The article is worth a read.
This assumes you have relatively normal air temperature and pressure.
Things change quite a bit if you interpret space to mean “open vacuum of space”
Then you have to decide if you mean orbit exposed to solar radiation, or interstellar exposed to galactic radiation. Or just in null gravity with null radiation.
This question can have a lot of answers depending on context.