As billionaire entrepreneurs like Jeff Bezos, Elon Musk and Richard Branson shoot for space, there are reminders that space travel is not always a safe luxury.
A number of people have died attempting to leave the Earth, but not every accident is fatal. European Space Agency astronaut Luca Parmitano survived an alarming spacewalk in which water started leaking into his helmet and floated around.
It was not drinkable, so the Italian had to make a quick return to the International Space Station in one of the shortest spacewalks ever.
