To Boldly Go: The Science Behind Pooping in Space

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What Mike Mullane remembers most clearly about having his first bowel movement in space is the blast of cold air greeting his exposed rectum. Over the course of three week-long NASA shuttle missions in the 1980s—two for Discovery, one for Atlantis—Mullane was forced to answer nature's call six or seven times in zero gravity. Each time, he would have to strip naked, close a flimsy curtain around a titanium commode, position his buttocks to form a perfect seal around a 4-inch opening, and then follow a checklist posted nearby to make sure no fecal particles escaped into the deck—all while his sphincter insisted on clamping shut to escape the freezing temperatures.

"It was a complex operation," Mullane tells Mental Floss. "On Earth, I'm fast. My wife is amazed I can be in and out of the bathroom in one minute for a number two. On the shuttle, it would take 30."

While the industrial toilet was a far cry from five-star hotel room seat warmers and bidets, it also improved by magnitudes the ordeal of emptying one's intestines in zero gravity. Prior to 1972, the men of the Gemini and Apollo missions braved poop bags that they would stick to their rear ends, then manually knead the contents with an antibacterial solution so the gases wouldn't detonate the collection; more than one crew has been terrorized by rogue turds hovering in the air.

Coming up with a practical way of replicating the earthbound poop experience took many years, many engineers, and a whole lot of ingenuity. While few explorers like to discuss it, taking a space dump is its own kind of heroism.

Consider one early—and discarded—solution for waste collection in space, which someone dubbed the "sh*t mitt." Donald Rethke likens it to "those long rubber gloves veterinarians use for insemination." The idea, he tells Mental Floss, was that the astronaut could poop in their own hand and then turn the glove inside-out, creating instant containment of the feces.

Now 80, Rethke is a retired engineer from Hamilton-Standard, a NASA subcontractor working through Northrop Grumman that spent decades refining or pioneering life-support systems for space explorers. Rethke, who embraces his industry nickname of "Doctor Flush," says that handling poop simply wasn't much of a concern due to the brief trips taken by pioneering astronauts: They could just go before they left. But as missions grew longer, it became necessary to address personal waste—urine and bowel movements—without dealing with the discomfort of diapers.

A NASA training commode
A training toilet with a camera positioned inside so astronauts can learn how to best angle their buttocks.
National Geographic, YouTube

For the 1965–66 Gemini excursions, which were planned to prove humans could survive for several days or weeks in space, astronauts were told to use a condom-like sheath that would direct urine into a bag. For feces, they were to use a pouch with a 1.5-inch opening and an adhesive strip around the edge to help prevent fecal matter from escaping. A fellow crew member would be told to stand by and watch to make sure no waste escaped into the capsule.

"It kind of looked like an upside-down top hat," Mullane says. Though they pre-dated his missions, they were on board his shuttles in case of equipment failure. "We never had to use them, thank God."

But the occupants of Gemini and Apollo did, and most found it unpleasant for reasons unrelated to crapping in a bag. When gravity is lacking, surface tension becomes a dominant force. So urine and feces that would separate from the body on Earth thanks to gravity tend to cling to the skin's surface in space.

"If you stick your finger into a glass of water and lift it up, water flows off," Mullane explains. "But in weightlessness, the attraction of the molecules of the fluid will pull it into a ball. If you leave fluid alone, it will form a perfect sphere. Touch it, and will stick to you."

The same goes for poop. The bags had tiny finger covers built in so users could flick and scrape errant flecks away from their cheeks. Then they'd mix in a chemical to kill the bacteria so the gases wouldn't expand in the sealed bag and create an explosive biohazard.

"Well, it's in a small, like a ketchup, a little plastic container like you find ketchup in in restaurants, in a cafeteria or something, it's like that," Apollo astronaut Russell Sweickhart told a reporter in 1977. "You tear the slit across the top, being careful not to squeeze it so the stuff comes out, and then you drop that into the fecal container, and then seal the fecal container. Then you squeeze it through the, you know, externally, you know, which forces it out of the container, and then you mix it by massaging the fecal bag. It's really fun when it's still warm."

If everything went well, it was merely disgusting. If it didn't, as the following transcript excerpt from the 1969 Apollo 10 mission demonstrates, it could be highly disruptive:

Tom Stafford: Give me a napkin quick. There's a turd floating through the air.

John Young: I didn't do it. It ain't one of mine.

Gene Cernan: I don't think it's one of mine.

Stafford: Mine was a little more sticky than that. Throw that away.

Young: God Almighty.

"When the Apollo astronauts came back," Rethke says, "they wanted sit-down toilets."

A look at the ISS bathroom
The "orbital outhouse" inside the International Space Station.
NASA

While modesty may not have been an achievable goal, astronauts needed some semblance of routine. (Some shuttles were equipped with kitchen tables, even though nothing in zero gravity could be perched on one.) But the comforts of a domestic commode had little application in space. No water could be used: It would run everywhere. And unlike gravity-assisted toilets, a shuttle john would have to address the surface tension issue that enticed poop to come out in curls instead of straight down, mashing itself against the skin.

The solution, according to Rethke, was gentle suction. "Or, as I like to call it, air entrainment," he says. In its simplest form, it's getting the poop Hoovered away from your bottom using air flow as a substitute for gravity.

Rethke says the idea was already on the table courtesy of General Electric (GE) when Hamilton-Standard began working on a zero gravity toilet, and that his job was one of refinement that lasted through the 1980s and 1990s. "The concept of separating solids from the body was already in the bag, no pun intended. It was just the best way. Most of my effort was how to do that economically."

NASA had previously toyed with a variety of designs, including one 1971 model that was mounted vertically on a wall to conserve space. Another took the feces and pulped it, a model not unlike evacuating into a blender. This, engineers realized, created the potential for fecal "dust," or powdered particles of poop, that could contaminate the cabin of spacecraft. By using air entrainment, hardly anything could escape the bowl—and if it did, it wouldn't be atomized to the point of being a biological hazard. Instead, a fan and vacuum system was used to encourage the waste to settle at the bottom of the waste tube.

Air entrainment made one frustrating demand of its users: proper anal positioning. With a 4-inch opening compared to a conventional toilet's 18 inches, astronauts had to align themselves up perfectly in order to avoid any escaping feces. To train astronauts heading for space, NASA set up a commode with a camera mounted inside. (You were not expected to make a deposit.) Users could gauge their perch based on freckles or other skin marks in relation to the seat. Properly docked, they could poop on target, but it took practice.

"It's hard to know where your a-hole is when the hole is that narrow," Mullane says.

Minor complaints aside, NASA's work was ready in time for the 1973 debut of Skylab, the first space station, and the 1981 launch of Columbia, the first shuttle to reach space. After realizing the pulverizing model wasn't going to work due to the fecal dust issue and other malfunctions that led to problems on 10 of the shuttle's first 11 voyages, a redesigned system less prone to clogging was introduced in the mid-1980s.

Urinating, according to Mullane, was never any big deal. Men and women use a form-fitting cup and gentle suction to empty their bladder. "Pretty simple," he says. "But solid waste, that was kind of like going in a camper toilet."

On the Atlantis and Discovery, the space commode had foot rests and thigh straps so astronauts could remain secure to the seat while doing their business. They'd typically opt to strip naked in the event any soiling occurred. To the right was a hand lever; pushed forward, it slid open the tube underneath their buttocks. "You never wanted to open that before sitting on it," Mullane says. Doing so could release the previous user's residual fecal matter into the air.

Once Mullane was strapped in, he would open the tube cover and feel the rush of cold air hit his rear. The air moved 360 degrees while a fan underneath—loud enough to mask sounds of elimination—pulled waste away from the body and into a container that would store the matter until the shuttle returned. Toilet paper would go in a separate bag. By the time Mullane got dressed, cleaned the toilet's edges, and exited, 30 minutes had passed.

Surprisingly, the intimate size of the shuttle didn't contribute to any fragrant evidence. "They did a really good job of filtration," Mullane says. "You never smelled anything."

Rethke improved on this in the early 1990s by compacting the discarded feces at the bottom, reducing the need for storage space. (To make sure it would stay sealed, Rethke once kept a feces-filled container in his office for a year.)

Small tweaks aside, the space toilet doesn't follow the update schedule of, say, an iPhone. What Rethke redesigned and what Mullane used is, by and large, what's still in use on the International Space Station (ISS) today. But instead of bringing waste back, it's discarded so it burns up in the atmosphere.

Future movements may prove more difficult to handle. With the advent of long-duration travel, possibly to Mars, on the horizon, space exploration will have to deal with the issue of waste management when there's virtually no chance of Earthbound assistance.

"When toilets fail [on Earth], it's a real pain," Mullane says. "Just imagine that on Mars. I have no idea how they're going to do that."

Someone might. In early 2017, the HeroX platform crowned a winner in its Space Poop Challenge, which crowdsourced ways to handle waste in space when an explorer is in a spacesuit and away from a fixed toilet for long periods. The winning idea—a suit hatch that can be used to insert inflatable bedpans and diapers—earned inventor Thatcher Cardon a $15,000 prize. If it works, it'll assist in an integral part of exploring beyond our atmospheric borders. In space, everyone needs to go.

Additional Sources: Riding Rockets: The Outrageous Tales of a Space Shuttle Astronaut

This Amateur Rocketeer Builds Functioning, Miniature Replicas of SpaceX Rockets

Jeff J Mitchell, Getty Images
Jeff J Mitchell, Getty Images

Amateur rocketry is a hobby that predates NASA. Hobbyists have successfully made it to space using rockets built without the massive budgets and resources available to larger organizations. And some of these rockets do more than reach incredible heights: As Motherboard reports, Joe Barnard, a 25-year-old rocketeer from Nashville, Tennessee, is working on making model rockets capable of propulsive landings, the same trick that makes some SpaceX rockets reusable.

Most rocket boosters that propel loads past the Earth's atmosphere are designed to go only one way. In 2015, Elon Musk's space exploration company SpaceX made history when it successfully maneuvered the boosters used to launch its Falcon 9 rocket back onto the landing pad. SpaceX says its latest version of the rocket can be re-flown up to 100 times, saving the company millions of dollars per launch.

Joe Barnard is bringing this same level of innovation to the amateur rocketry world. He first became interested in aerospace engineering after watching early SpaceX videos, and instead of earning a degree in the field, he taught himself the basics. He's since made rocketry into a career, founding Barnard Propulsion Systems (BPS), a small business that sells supplies to other hobbyists, and working on rockets of his own.

Like the rockets at SpaceX, Barnard's creations use thrust vectoring—the technology that makes it possible to navigate and stabilize a rocket after launch—only on a much smaller scale. He's built miniature models of SpaceX's Falcon 9 rockets, and as is the case at SpaceX, his launches don't always run smoothly.

Barnard is still perfecting propulsive landings in amateur rockets, but for now he says each failure is a learning experience. You can watch the progress of his experiments on his YouTube channel.

[h/t Motherboard]

Ad Astra: The Time Earth Almost Got a Space Billboard

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In the 1980s and well into the 1990s, everything associated with Arnold Schwarzenegger was big. Big biceps (22 inches during his bodybuilding heyday). Big box office (1991's Terminator 2: Judgment Day made $520 million worldwide, the highest-grossing movie of that year). So it was no surprise to open a newspaper in 1993 and see that Columbia Pictures was spending $500,000 to plaster the actor's name and the title of his pending summer blockbuster, Last Action Hero, on the fuselage of a NASA rocket set for launch that June. Schwarzenegger himself was scheduled to push the button that would propel the spacecraft into orbit.

The NASA project deal was being brokered for commercial advertising purposes by Space Marketing Inc., an Atlanta-based firm specializing in sponsorships and ads located outside of the atmosphere. The company's CEO, Mike Lawson, told the Los Angeles Times that he could've sold "dozens" of ads for the rocket, but that he and NASA officials didn't want it to "look like a pace car at the Indy 500."

The idea of promoting a movie in space was brazen, but not nearly as much as another, more ambitious project that Lawson was planning. If everything went according to plan, his Space Marketing would shoot a payload into space in time for the 1996 Summer Olympic Games in Atlanta. Once it was in orbit, mylar tubes would inflate with gas and spring open to support a mile-wide, quarter-mile tall reflective sheet that would be visible from Earth. Lawson called it an "inflatable platform," but the press—and critics—quickly labeled it something else: a space billboard.

If Lawson had his way, it would be able to make everything from the Olympic rings to the McDonald's logo as visible to Earthbound consumers as a full moon.

 

In Robert Heinlein's 1950 novella The Man Who Sold the Moon, a lunar entrepreneur hustles to sell advertising space on the moon as part of his attempt to make colonization a profitable venture. Lawson—a onetime director of marketing for his father's publishing company in Atlanta and a fan of science fiction—read the story. In 1988, he founded Space Marketing as a way to defictionalize the concept.

As fantastic as it sounded, the idea wasn't without precedent. In 1981, telecommunications mogul Robert Lorsch made a presentation to Congress that outlined a strategy for allowing corporations to "sponsor" space travel by letting them buy plaques that would go onboard spacecraft. In the same way they endorsed the Olympics, Lorsch said, corporate America could help subsidize space travel.

A McDonald's logo is visible from space
iStock Collage

The plan was a response to then-president Ronald Reagan's plea to have the private sector assist in helping the government overcome their financial burdens. While Lorsch's proposal was prescient—it anticipated the rise of privatized space exploration—the idea of having commercial sponsors for NASA didn't make it through the Byzantine maze of Washington bureaucracy.

Lawson thought the idea could be taken further, and not necessarily with the cooperation of government. Partnering with scientists at the Lawrence Livermore National Library and the University of Colorado, Lawson developed a plan to allow instruments developed by these institutions to go into orbit and collect information about the ozone layer. To underwrite the project, he would solicit commercial advertisers for the mile-long mylar sheet that would exit the atmosphere rolled up and then expand to full size once it reached orbit. The aluminized lettering would reflect the sun's rays, making whatever graphic it displayed visible for 10 minutes at a time at any given point on Earth. After roughly 20 days, it would disintegrate, leaving the sensors behind to continue collecting data for researchers.

'We could actually fly [the] Golden Arches in space," Lawson said in May 1993, referring to the ubiquitous McDonald's logo. With an estimated launch cost of $15 to $30 million, companies buying ads would cover expenses as well as contribute to a profit for Space Marketing—perhaps paying as much as $1 million for every day it was visible.

A few months later, the city of Atlanta began investigating Space Marketing's concept as a possible advertising vessel for the 1996 Olympics. "Special" glasses given away at point-of-purchase displays with cooperating sponsors would allow people to see the Olympic rings in orbit.

That last point appeared to be a concession to a growing chorus of concern over the idea of using space as a commercial entity. While proponents of the idea argued it was similar to blimps sailing overhead and displaying corporate propaganda messages, a coalition of scientists argued otherwise. Carl Sagan called it an "abomination," insisting that astronomy could soon become a practice of exploring the stars wedged between mile-wide ads for fast food and automobiles.

Consumer advocate Ralph Nader led a group calling for an orbital billboard ban, labeling it a practice of "defacing the heavens." Other groups decried it as commercial pollution of space and vowed to boycott any companies involved. Supporters of Nader's Public Interest Research Group picketed Space Marketing's Atlanta headquarters.

Lawson tried to parry the attacks in media, saying that the phrase "space billboard" was the source of the controversy. He preferred the term "environmental billboard" and said that the whole objective was to have a global company foot the bill for scientific research.

 

Conceptually, the idea of a floating Arby's logo the perceived size of the moon was too dystopian for lawmakers to handle. In 1993, Congress submitted legislation that would prohibit the Transportation Department from issuing a launch license to any company prepared to shoot a corporate image into space. (The bill was eventually signed into law by Bill Clinton in 2000.)

None of this publicity was particularly helpful to Space Marketing, which saw its Olympic plans wilt in the face of both legislative opposition and the probability of massive pushback from space advocacy groups. They turned their attention to Russia, which had no ethical objections to space endorsements, and facilitated a 1999 project that saw Pizza Hut attach its logo to the Proton rocket that carried supplies to the International Space Station. (The chain previously considered projecting its logo with lasers on the surface of the moon but abandoned the idea when they realized it would cost hundreds of millions of dollars.)

A rocket is propelled into space
iStock

Space Marketing's investors moved on to the blimp industry and the firm was dissolved by 2007, when Lawson became CEO of airship manufacturer Techsphere Systems. As for the Last Action Hero stunt: It dissolved when Columbia learned Lorsch was threatening legal action, claiming he owned a copyright on the idea of commercial space advertising. The movie itself also failed to launch, becoming a notorious summer bomb when it was pitted against Jurassic Park.

While space has largely been off-limits to such "obtrusive" advertising by law, not everyone agrees that's for the best. Earlier this month, it was reported that NASA is looking into selling off the naming right to its shuttles as a way to recoup some of the organization's costs. When Lorsch testified before a Senate subcommittee in 2004 to review his 1981 proposal, he said that his sponsorship program might have earned NASA $5 billion in revenue if it had been implemented.

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