Luca Parmitano nearly drowned when water leaked into his helmet during a spacewalk. This incident occurred during a six-hour mission that Parmitano undertook with fellow astronaut Chris Cassidy in ...

Even though spacesickness is a common ailment in orbit, no astronaut has ever vomited in his or her helmet, which would pose a serious risk of choking. Spacewalkers have been known to cough on the ...