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By the lack of hydrogen adsorption in the spectrum. If it was really far away, hydrogen floating around between the galaxies will leave its mark on the spectrum.

I can't remember if I read it in the book or the mission reports, but the reason they didn't wear the suits was that without the cooling systems running they are too warm. Climbing out of a hot suit into the cold cabin while covered in sweat would be far worse than just putting up with the cold.