Totally awesome fact we learned today:

You can’t cry in space. Really.

Here’s how we found that out.

A spacewalking astronaut almost had to go back into the international space station Wednesday when something got in his eye and made it sting “like crazy.”

Shuttle Endeavour astronauts Andrew Feustel and Mike Fincke had just finished running power cables in the orbiting house when Feustel told crewmates about his eye problem.

“Just as an FYI, my right eye is stinging like crazy right now. It’s watering a lot. Must have gotten something” in it, Feustel said.

“Sorry, buddy,” Fincke replied.

Feustel managed to rub his eye against a strap in his helmet and said that helped. The spacewalk continued as planned.

The spacewalkers noted that the problem with tears in space is that “they don’t fall off of your eye . . . they kind of stay there.” It makes sense, because there’s no gravity in space, but we bet you’d never thought about it!