To be a bit pedantic, the dangerous effect of the vacuum of space is the lack of oxygen and rapid suffocation, apparently within seconds: https://en.wikipedia.o

To be a bit pedantic, the dangerous effect of the vacuum of space is the lack of oxygen and rapid suffocation, apparently within seconds: https://en.wikipedia.org/wiki/Effect_of_spaceflight_on_the_human_body#Vacuum https://en.wikipedia.org/wiki/Effect_of_spaceflight_on_the_h.... The other effects (like ebullism and freezing/overheating/sunburn come "much" later in minutes).