Things You didn't Know
From ABC News
Snow White's seven dwarfs could do it. So could Andy Griffith. Lauren Bacall told Humphrey Bogart, "You just put your lips together and blow."
They could all whistle, but astronauts on spacewalks will never, ever be able to whistle while they work.
Former astronaut Dan Barry has seven hours of spacewalking time to his credit. He tried whistling during his spacewalk on STS-96 in May 1999.
"It wasn't something I hadn't planned — I thought of it on the fly. It turned out that it didn't work.," he said.
Barry called down to Mission Control and said, "Houston, EV2. The science types might like to know that it is not possible to whistle during an EVA."
So why can't people whistle while spacewalking? Barry said there is a simple explanation.
"You can't whistle because the air pressure in the suit is only 4.3 [pounds per square inch], and normal atmospheric pressure is 14.7 psi, so there are not enough air molecules blowing by your lips to make a sound," he said.