A Canadian astronaut based at the International Space Station has demonstrated why it's not a good idea to get teary-eyed in space.
Chris Hadfield, whose regular photographs of Earth from orbit have made him a social media celebrity, mimics crying by squirting water into one of his eyes in a video published by the Canadian Space Agency.
Instead of falling down his face as regular tears would, the water continues to pool in and under Hadfield's eye – forming a liquid ball that appears to float around his face.
As he adds more water, the ball continues to grow, spreading across his face and into his other eye.
"Just as if I started crying my eye is full of tears but you can see it just forms a ball on my eye," Hadfield says.
Hadfield made the video after he received a number of questions about crying in space and what happens to an astronaut's tears.
"Yes I've gotten things in my eye, your eyes will definitely cry in space but the big difference is tears don't fall," he said, before having to remove the water on his face with a cloth.
Author: Dave Meddows. Approving editor: Mark Worley.
Source: Canadian Space Agency (YouTube)