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Cleaning up our space

As the race to explore space intensifies, so does the problem of space junk. With millions of pieces of debris orbiting the Earth, scientists are sounding the alarm that the issue poses a serious threat to future space missions.

Earth’s low orbit, 2,000 kilometers or less from the Earth’s surface, is home to the vast majority of space debris. The debris consists of defunct satellites, upper launch stages, fragments from explosions and pieces left over when countries shoot missiles to take down their own satellites. Many pieces of debris are larger than tennis balls, and most no longer serve any functional purpose. Basically, there’s a lot of garbage flying around up there.

And this garbage is flying at astounding speeds.

Imagine you’re driving home from work, traveling 80 kilometers per hour when a small stone flies up, striking your windshield. It makes a loud noise, and later you notice a crack in the windshield. The velocity of both objects — the car and the rock — determines the level of damage.

Now imagine you’re traveling at over 25,000 kilometers per hour, and so is the stone. At this speed, collision with a stone would be catastrophic, but even something tiny can cause serious damage.

European Space Agency astronaut Tim Peak in 2016 noticed a crack in the observation window of the International Space Station. In a press release, Peak described a photo he took of the crack: “I am often asked if the International Space Station is hit by space debris. Yes — this is the chip in one of our cupola windows, glad it is quadruple glazed!”

The damage was caused by a rogue fleck of paint.

There are about 27,000 pieces of debris larger than 10 centimeters being monitored by the U.S. Department of Defense. More than 100 million smaller pieces fly around untracked. Any impact with other spacecraft, satellites or space stations could be devastating and in turn cause more debris, and so on and so on.

IMAGE: NASA, ESA, Shutterstock

The chain reaction, theoretical at this point, is known as Kessler syndrome. Astrophysicist and one-time NASA scientist Donald J. Kessler proposed that at some point there will be so much debris in Earth’s low orbit that it will continue to crash and create more debris, eventually becoming autonomous and unstoppable and making future space travel impossible.

Though Kessler syndrome is an extreme example, it’s not impossible. Moog Professor of Innovation and SUNY Distinguished Professor at the University at Buffalo, John Crassidis, says he believes we will reach this point in this generation.

“I really think that we’ll be in trouble in 50 years or less if we keep putting objects up in space like we are doing now,” he tells KUST Review.

Though 50 years isn’t far off, more imminent risks exist to satellites and other spacecraft in Earth’s low orbit.

Crassidis, who works with NASA and the U.S. Air Force to monitor space debris, says the biggest risk is to humans — specifically to those doing extravehicular activities. “Debris is moving at 17,000 miles per hour. That can go right through a spacesuit, even a very tiny piece of debris,” he says.

CAPTION: Japanese company Astroscale is hoping to inspire a movement of space cleanup IMAGE: NASA

Other risks exist for active satellites in Earth’s low orbit. This may not sound concerning but these satellites allow Earth dwellers to make calls on their iPhones, watch videos on TikTok, participate in Zoom meetings and make millions as YouTubers. So, if these satellites are knocked out by debris traveling over 25,000 kilometers per hour, Gen X, millennials, and well, pretty much everyone, could be in for a trip — not to space — but back in time.

Among other concerns are for the 10 individuals living on active space stations. There are two inhabited space stations in Earth’s low orbit — the International Space Station and China’s Tiangong space station. Space stations are protected by their outer shields from debris up to 1.5 centimeters in diameter, but other than that, it’s either evacuate or duck. Thus far, both have proved successful solutions.

Russia in 2021 launched a rocket at one of its own satellites as a test, creating more than 3,500 pieces of debris and putting those living on the International Space Station at risk. The astronauts were forced to move into their spaceship capsules docked on the station should they need to make a quick get-away. And in October 2022, the International Space Station had to be raised by 0.2 miles to avoid more fragments resulting from this test.

This evasive maneuver — with a price tag of about U.S.$1 million — was effective, but even a collision with a piece of debris between 1 and 10 centimeters in diameter could cause damage costing up to U.S.$2 million to fix. Crassidis says this is only one of more than 20 maneuvers the space station has performed to avoid large pieces of debris.

Though moving the space station is currently a feasible — albeit expensive — solution, experts are concerned that with the increasing volume of debris each year, a safe space environment will cease to exist.

And researchers have discovered that collisions aren’t the only environmental risk factor.

A 2023 study by the National Oceanic and Atmospheric Administration found metallic particles consistent with materials used to build spacecraft within the world’s stratosphere. This is caused when defunct satellites and rocket bits vaporize as they re-enter the Earth’s atmosphere.

BUT WHAT IS THE SOLUTION?

While the United Nations holds guidelines for space-debris mitigation, there is no legislation in place to hold space explorers responsible for their mess. So, it’s basically down to innovation and doing the right thing.

“We can’t even get countries to follow United Nations Guideline Number 4: Avoid intentional destruction and other harmful activities. Our leaders need to start talking with each other. That’s the first step, but not all countries are doing that. We (the Americans), the Europeans and other countries do follow many of the guidelines,” Crassidis says.

CAPTION: Debris orbiting the Earth poses a risk to satellites, astronauts and future space missions IMAGE: Shutterstock

So, while some governments are doing what they can to clean up their mess, start-up businesses are popping up to pick up the pieces. Take Japanese company Astroscale, for example.

Astroscale offers space-debris removal as a service. Space programs or private companies world-wide can hire it to collect debris and drag it into Earth’s atmosphere to burn up. Astroscale plans its first official removal mission to take place in 2025. The company is hoping to inspire a global movement of debris removal.

In the meantime, the European Space Agency has partnered with start-up Clearspace to launch a claw that will grab hold of space junk and pull it back into the atmosphere to burn up. The claw is expected to remove its first piece of debris in 2025.

But that may cause problems, too. The 2023 NOAA study found that the offset contributes to ozone depletion.

Until these projects become regular practice, Crassidis’ research focuses mainly on prevention by “trying to determine the characteristics of debris from unresolved images. These updated models can be used to better predict where the debris is in space, thereby helping to better determine the probability of collision with functioning satellites,” he says.

Crassidis and his colleagues are also working on a plan to recycle space debris but, “This technology is 15 to 20 years away from being practical.”

Crassidis says that one day there will be a practical and affordable solution to space debris.

“What is today’s science fiction is tomorrow’s reality. The best thing we can do is follow the U.N. guidelines, slow the growth of the debris, and then have technology catch up to clean it up,” he tells KUST Review.

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6 innovative ways to store energy

As the world looks to a renewable-energy future, storage becomes a concern because with renewables, supply and demand aren’t always in balance.

Renewable energy sources such as wind and the sun aren’t always “on” when consumers need energy, and excess power that can’t be used immediately is wasted unless it’s stored.

Storing energy can be expensive, however, so some utilities use plants that burn fossil fuels to make up the difference during times of peak demand. Those plants operate most efficiently when at full power, however, and using these plants to redistribute power can lead to more pollution.

Chemical batteries are useful for electric vehicles but they may not be the best option for utility companies. Chemical batteries’ life cycles can also be short. Lithium ion batteries, for example, last about five to 10 years. They’re expensive. And the metals used to make them raise issues of geopolitics and human rights.

Looking at other materials seems to be a good idea.

Here are six innovative materials and methods we might use instead:

PUMP STORAGE WITH WATER

This isn’t a new idea: People have been using pump storage since the early 20th century. Early pump storage used fossil fuels to move water from a lower reservoir to a higher one during off-peak hours, when that energy was cheapest. Then when the energy was needed, gravity returned the water to the lower reservoir, turning turbines as it flowed. Such systems today can substitute renewable energy for power from fossil fuels. This is the most popular method of storing electricity today and accounts for 93 percent of utility-scale energy storage in the United States.

GRAVITY BATTERIES

As with the pump-storage system, this uses renewable energy to raise an object from a lower level to a higher one. But instead of water, it’s a heavy mass that generates gravitational potential energy. When the energy is needed, the mass is slowly dropped. The motor that raised it in the first place switches to generator mode and energy is sent off to the consumer. How much energy is produced and how long it is generated depends on the height and weight of the lift. One company working with the technology, Gravitricity in Scotland, is investigating the use of deep decommissioned mines for gravity energy storage. The company estimates that some 14,000 mines around the world could be repurposed for energy storage.

FLYWHEELS

A flywheel can be as simple as the power system in a child’s friction toy or as complex as NASA’s G2 system for energy storage in a spacecraft. The flywheel is essentially a mechanical battery with a heavy weight that rotates around an axis. Energy gets the wheel spinning. And if it spins fast enough, it can store energy. The limiting factors are friction and how much force the wheel can take before it breaks.

SAND BATTERIES

The sand battery uses sand or a sandlike substance heated to temperatures well above the boiling point of water – about 500 degrees C. Cool air blown through pipes in the storage facility picks up the heat and can be used, for example, to convert water into process steam. The first commercial sand battery in Finland uses about 100 tons of low-grade sand to warm homes, offices and a municipal swimming pool year-round, and its developers say the sand can hold its heat for months.

THERMODYNAMIC STORAGE USING COMPRESSED AIR

This system uses electrical energy to create high-pressure compressed air, which can be released later to drive a turbine generator. Utility-scale versions of these systems are generally located in caverns. A variant of this storage system is underwater compressed air energy storage, which benefits from the constant water pressure and could be useful for coastal locations.

WOOD BATTERIES

About 30 percent of a tree – depending on species – is lignin, the glue that holds its cellulose fibers together. The polymer lignin also contains carbon, which as it turns out is a great material for a battery part called an anode.

Finland’s Stora Enso happens to have lots of trees: It calls itself the one of the largest owners of private forest in the world. And according to the BBC, the company’s engineers say they can extract the lignin they need from waste pulp the company is already producing.

Stora Enso has entered into a partnership with Swedish company Northvolt to create batteries sourced sustainably in Nordic countries. They expect to be in production as early as 2025.

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Making space for women

The UAE is celebrating International Women’s Day a little early this year with news of the first female Emirati astronaut set to graduate from NASA.

Nora Al Matrooshi, NASA class of 2023, will graduate in March 2024 alongside her Emirati counterpart Mohammed Al Mulla, the National reports. The ceremony will take place in Houston, Texas.

Al Matrooshi, an engineer formerly of the National Petroleum Construction Co., was one of two candidates chosen from over 4,000 applicants for the 2021 NASA training program.

When she was initially selected, Al Matrooshi in a media conference said she was inspired to reach for the stars by one of her teachers who would set up a tent in the classroom and ask the students to try to imagine it was a spacecraft en route to the moon.

In 1963, Valentina Tereshkova of Russia became the first woman in space, but the next wasn’t until two decades later.

In 2020, Phys.org reported that only 11.5 percent of the 566 people who have gone to space were women, and the United Nations Space4Women program reports that 20-22 percent of the space workforce is women – virtually unchanged from what it was 30 years ago.

But the flight crews are increasing in female numbers and Al Matrooshi aims to be an inspiration for other young women: “If I can do it, then you can do it too. If no one has done it yet, then you just go ahead and be the first,” she said in a 2021 interview with The National.

This brings the Emirati astronaut count to four as the UAE space program grows and continues to rack up firsts.

CAPTION: International Space Station IMAGE: NASA

The first Emirati astronaut, Hazza al Mansouri, spent eight days aboard the International Space Station in 2022, followed by Sultan Al Neyadi with a six-month stay in 2023 and first Arab space walk.

Al Matrooshi’s graduation coincides with the most recent advancement in the UAE’s space program – a ticket to the moon.

The UAE recently agreed to provide NASA with an airlock for the Gateway lunar station, which will serve as an exchange center for crew and science payloads. The deal comes with UAE access to the station and a lunar mission. The deal comes with UAE access to the station and a lunar mission.

No decisions have been made about which UAE astronauts will be selected for the first UAE lunar mission.

According to NASA, the Lunar Gateway will record its first mission no sooner than 2028.

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In space, no one can hear you flush

Ensuring the accessibility of water on Earth is a priority for science in the coming years to be certain.

But so is making sure it’s available in space.

It isn’t like finding water in space is impossible. The chemical elements that make water – hydrogen and oxygen – are abundant in space.

“NASA science activities have provided a wave of amazing findings related to water in recent years that inspire us to continue investigating our origins and the fascinating possibilities for other worlds, and life, in the universe,” says Ellen Stofan, a chief NASA scientist, on NASA.gov.

NASA astronaut and Expedition 65 Flight Engineer Mark Vande Hei services components on an advanced new toilet installed inside the International Space Station’s Tranquility module. CREDIT: NASA

NASA points to the four giant planets in our solar system – Uranus, Jupiter, Saturn and Neptune – as being likely to contain large amounts of water. There is also evidence that five moons of Jupiter and Saturn contain oceans under their surfaces.

In 2020, NASA announced the discovery of H2O in sunlit areas of the Earth’s moon, suggesting that the water molecule is widely distributed across the lunar surface.

And scientists have discovered a huge cloud of water vapor about 30 billion miles away that contains at least 140 trillion times the amount of water in all of the seas and oceans on Earth.

In fact, all of the water here came from out there as ice piggybacking on the comets and asteroids that plowed into a hot and dry young Earth. That’s right: Water is alien.

We recycle about 90 percent of all water-based liquids on the space station, including urine and sweat.”

– Jessica Meir , astronaur

For privacy, the toilet is located inside of a stall just like in a public restroom on Earth. CREDIT: NASA

But ensuring a steady supply for humans venturing out into space is a bit more complicated right now than steering into a vapor cloud or drilling into a frozen moon. Explorers will have to ensure they bring and manage whatever they need.

“We recycle about 90 percent of all water-based liquids on the space station, including urine and sweat,” says astronaut Jessica Meir on NASA.gov. “What we try to do aboard the space station is mimic elements of Earth’s natural water cycle to reclaim water from the air. And when it comes to our urine on (the International Space Station), today’s coffee is tomorrow’s coffee!”

Part of the liquid-recovery process is accomplished with NASA’s new space toilet: The $23 million Universal Waste Management System launched to the ISS in 2020.

The toilet, designed for male and female astronauts, aids in recycling more urine for tomorrow’s coffee. The water in fecal content is not currently being recycled, but NASA scientists are looking into it.

That could help them do better than their current 90 percent recovery rate. NASA wants to bring that recycling rate to 98 percent before humans board a proposed Mars transport vehicle for missions expected to last two years round-trip. NASA is aiming for the Mars missions to begin in the 2030s.