The Atlantic:

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, astronaut Andrew 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,” she said.

In other words, yep: There’s no crying in space.

Even worse? According to the article, “space tears” actually can hurt.