The act of going into space is very apparent. There is a giant rocket you are strapped to. My point isn't arguing "spontaneous boiling", which in this case is used correctly. But rather the common use of spontaneous in this thread is defined as having no apparent cause. That's just not true. There is a cause, in the picture, the pressure of the room is being manipulated. And the reason for the water boiling is the ΔP.