Technically, you can cry in space. However, the microgravity does not allow individual tears to stream down your cheeks like on Earth. Instead, tears build up into big liquid balls that rest in your eye sockets until your shake your head around to break it up. Apparently, if you let the tear balls get large enough on your face, they will break off and simply float away.
Crying Liquid Balls Of Tears In Space
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Key Facts In This Video
When you cry in space, tears well up into big liquid balls that stick on your face. 00:32
You can cry in space, but your tears won't fall. 01:07