Sometimes it's hard for us non-astronauts to envision what it is like to be in space, which is a zero-gravity apparatus. Megan Garber from The Atlantic gives insight on the fact that it is impossible to cry in space.
Astronauts can, certainly, tear up -- they're human, after all. But in zero gravity, the tears themselves can't flow downward in the way they do on Earth. The moisture generated has nowhere to go. Tears, Feustel put it, "don't fall off of your eye ... they kind of stay there." NASA spacewalk officer Allison Bollinger, who oversaw Feustel's EVA, confirmed this assessment. "They actually kind of conglomerate around your eyeball,"