Space is unpredictable. Our limited understanding of the cosmos makes every mission an unknown.
What's in a spaceman's helmet? Is it a dead star collapsing, a black hole collecting hostages, an extraterrestrial lifeform, or nothingness? Who knows?
Even simple spatial activities are questionable, according to Mental Floss.
Toothbrushing is difficult, and nail trimming may be painful.
According to our estimates, a prospective space cadet can almost certainly see just one thing. ScienceDirect says it's neither a nebula nor Saturn's ice ring. Blood.
Gushing cosmic haemoglobin. This isn't the tame blood shown on "Grey's Anatomy." This is cooling space blood.