The most human detail of humanity's return to the moon is a plastic cup and a blocked drain.
Four astronauts are flying to the moon for the first time in more than half a century, and the most talked-about piece of equipment aboard their spacecraft is the toilet.
NASA's Artemis 2 mission launched on April 1, carrying commander Reid Wiseman, pilot Victor Glover, mission specialist Christina Koch — all three from NASA — and Canadian Space Agency mission specialist Jeremy Hansen on a ten-day journey around the moon. It is the first crewed lunar flyby since the Apollo era, more than 53 years ago. And yet, from the moment the mission began, the Orion spacecraft's hygiene bay has commanded nearly as much attention as the crew itself.
The trouble started on day one, when the toilet's urine function went offline. Koch stepped in and got it working again, earning herself a new title in the process. 'I'm proud to call myself the space plumber,' she told reporters during a live video interview on April 3. 'I like to say that it is probably the most important piece of equipment on board. So we were all breathing a sigh of relief when it turned out to be just fine.' It was not, in fact, just fine.
In the days that followed, the crew noticed a strange burning smell drifting from the hygiene bay — a small compartment built into the floor of the Orion capsule, roughly the size of a lavatory on a regional jet. The odor reminded them of an electric heater firing up after a long dormancy. Debbie Korth, Orion's deputy program manager, addressed reporters at NASA's Johnson Space Center in Houston on April 4, saying engineers were still working to identify the source. Her best guess was benign: tape and other materials off-gassing in the spacecraft environment. 'I don't think there's any hazardous condition,' she said.
Then came a second problem. Late on Friday, the toilet's storage tank — roughly the size of an office wastebasket — stopped venting urine overboard after releasing only about three percent of its contents. Flight controllers suspected ice had formed in the vent nozzle, a predictable hazard in the deep cold of cislunar space. The fix was straightforward in concept if not in execution: on Saturday, Orion was maneuvered to point the vent nozzle directly at the sun for several hours, essentially baking out the blockage. The maneuver worked well enough to empty roughly half the tank, but the crew still could not use the toilet normally for urination.
While waiting for a resolution, the astronauts fell back on a contingency device — a cylindrical plastic container with an open end for urinating into, a cap to seal it, and a valve at the base to drain it into the tank. Each crew member has two of them. NASA astronaut Don Pettit, on Earth, posted photos of the devices on social media with a note that put the situation in perspective: when you are in cislunar space with a broken toilet, he wrote, these containers replace the need for roughly 25 pounds of diapers.
Late Saturday night, Koch radioed Mission Control with a question that managed to be both practical and quietly funny. 'One question back to you about, when do you expect we might be able to use toilet again?' she asked. When the capsule communicator, Jacki Mahaffey, said the teams were working on a forward plan, Koch followed up: 'I copy. Umm, would you authorize one use of the toilet?' Mahaffey said she would check.
The toilet at the center of all this is a compact version of the systems used on the International Space Station, and it cost $23 million to develop. Apollo-era astronauts had no such luxury — they managed with far more rudimentary arrangements. That historical gap is part of why NASA officials say the public fascination with Orion's plumbing problems makes complete sense. 'I think space toilets, and bathrooms, is something everybody can really understand,' Korth said. John Honeycutt, who chairs the Artemis 2 Mission Management Team, agreed. 'I think the fixation on the toilet is kind of human nature,' he said. 'Everybody knows how important that is to us here on Earth, and it's harder to manage in space.'
As the crew continues toward their lunar flyby, engineers on the ground are still working to fully restore the toilet's function. The mission itself is proceeding as planned — but for now, the most human detail of humanity's return to the moon is a plastic cup and a blocked drain.
Notable Quotes
I'm proud to call myself the space plumber. I like to say that it is probably the most important piece of equipment on board.— Mission specialist Christina Koch, in a live video interview on April 3
When you are in cislunar space with a broken toilet, you need contingencies, and the CCU replaces the need for about 25 pounds of diapers.— NASA astronaut Don Pettit, posting on social media from Earth
The Hearth Conversation Another angle on the story
Why does a $23 million toilet keep breaking down?
Space is an extraordinarily hostile environment for plumbing. Extreme cold can freeze a vent line solid, and even small design oversights become serious problems when there's no hardware store within a quarter million miles.
Is this actually a safety issue, or just an inconvenience?
Mostly inconvenience, but inconvenience with real consequences. Waste management in a sealed spacecraft isn't optional. If the primary system fails completely, the crew needs reliable backups — which is exactly why each astronaut has two contingency urinal devices.
What does it say that Koch fixed it herself on day one?
It says the crew is trained for exactly this kind of thing. Astronauts aren't passengers — they're engineers in flight. Koch didn't wait for Mission Control to solve it remotely. She diagnosed and fixed it herself, then asked for authorization to use it again when the next problem appeared.
Why did pointing the spacecraft at the sun fix the blockage?
The vent nozzle was almost certainly clogged with ice. Orienting the nozzle toward the sun for several hours raised the temperature enough to melt it. It's a low-tech solution to a low-tech problem — physics doing the work.
Apollo astronauts went to the moon without a proper toilet. How did they manage?
Poorly, by most accounts. They used bags and adhesive patches, and it was considered one of the most unpleasant aspects of the missions. The Orion toilet, even when it's misbehaving, represents a genuine leap in crew comfort and dignity.
Does any of this affect the mission itself?
Not the trajectory or the science. The lunar flyby is proceeding on schedule. But crew wellbeing matters on a ten-day mission, and a functional toilet is a significant part of that — which is why Mission Control is treating it as a priority even if it's not a crisis.
Why do you think this story has captured so much public attention?
Because it's the most relatable thing imaginable. People can't picture orbital mechanics or radiation shielding, but everyone understands needing a bathroom and not having one work properly. It makes the mission feel human in a way that technical briefings rarely do.