How to Pee in Space | StarTalk
So we have to ask Mike, “Yes, have you ever peed in your pants in space?”
“Yes, we didn't call it the UCD; we called it the MAG.”
“The MAG? The Maximum Absorbency Garment? It was a diaper?”
“Diaper! Yes, we wore a diaper on launch and entry, and while spacewalking. And then when you're inside the spacecraft, you use the toilet.”
“Okay, so where does the pee go if you do it in the spacecraft?”
“In the spacecraft, it's collected and then, as he described, you would want to see that the urine dump was cool 'cause you would dump it and it would crystallize. The sun would shine on it, and it was really fun. It was something!”
“I can't believe I’m having a conversation about a beautiful frozen pee! ‘Hey, everybody, it’s a urine dump!’”
“This is…hey, it’s a urine dump. And you know, before I hit the switch, everyone go to the window and watch!”
“So you're telling me your pee was orbiting the Earth?”
“Apparently, yes. I never thought of it that way, but yes. For a little bit until it crystallizes, you know it kind of disappears.”
“No, then it would reenter the atmosphere?”
“Well, yes. Yes.”
“Okay, yes. You peed on everybody? You peed? You peed on Earth?”
“Oh my gosh! Now, the secrets out! That's it.”