Breathe on Mars is one of the biggest challenges to human survival on the red planet. But a plasma technology may be a solution. Because it allows
When we speak of states of matter, we all remember solid, liquid, and gaseous states. But there are two more: Bose-Einstein condensate and plasma. The latter is found, for example, in the Sun. And now a team of researchers in Portugal says that it’s also the answer to one of the greatest challenges to human survival on Mars. It seems that breathing on the red planet may be more than a dream. Thanks to a plasma technology it’s possible to transform carbon dioxide into oxygen.
In addition to the icy climate (minus 60 degrees Celsius on average), Mars’ atmosphere is composed of 96% carbon dioxide. Besides, the pressure is about 150 times lower than on Earth. These features pose a serious challenge to the exploration and installation of space stations on the planet. But are also excellent for the creation of oxygen from the decomposition of carbon dioxide (CO2). Published in the Plasmas Sources Science and Technology journal, the scientific article says the key is the use of low-temperature plasmas.
“Plasmas are good for almost everything we can imagine”, explains Vasco Guerra, from the Higher Institute of Plasmas and Nuclear Fusion (IPFN) at the Higher Technical Institute (IST) in Lisbon. The researcher is the lead author of the article about oxygen production, which promises to simplify the logistics of a Martian solo mission.
But what exactly is a plasma? “We usually define a plasma as an ionized gas. In fact, it’s something more than that”, explains Vasco Guerra. “In a ‘low-temperature plasma’ only a small fraction of the molecules are ionized. Might be only one in a thousand, or one in a million, or even less. But it means is where electrons have a lot of energy. That allows very reactive species to be created and, for example, to dissociate molecules. The gas temperature, however, remains relatively low, while the gas heating losses are limited.”
Depending on the conditions of laboratory-created plasma, a relatively low temperature means that the gas is typically between 30 and 1500 degrees Celsius: “As opposed to a ‘hot plasma’, where all atoms and molecules are ionized. As in the case of the Sun, where temperatures are much higher [in millions of degrees].”
The team includes researchers from IPFN but also from the University of Porto and the Plasma Physics Laboratory (LPP) in Paris. They all believe that plasma can separate carbon dioxide from oxygen more efficiently in Mars than on Earth.
“It’s the plasma electrons that will induce the separation of oxygen from carbon dioxide”, says Vasco Guerra. Because they are very energetic, when they collide with a molecule of carbon dioxide, the electrons transfer a part of their energy to that molecule, that can break it or make it vibrate. And that’s the first step of a mechanism that also leads to the separation of this molecule.
And why effectiveness may be greater on Mars? First, because the lower atmospheric pressure of the planet would allow creating plasmas without the vacuum pumps (to lower the pressure) nor the compressors (to increase the pressure) needed on Earth. Second, because the temperature is ideal for the plasma to more easily break one of the chemical bonds that keep carbon and oxygen tightly attached, while preventing carbon dioxide from re-forming.
Human missions, but not only
The proposed method may provide oxygen for breathing. And fuel to return to Earth, since carbon dioxide and oxygen can be used to make blends for the propulsion of space vehicles. “It would minimize the risks for the crew and the mission, and reduce logistics. Because it allows increased spacecraft shield and self-sufficiency. In addition, it would also reduce costs by requiring fewer launch vehicles to complete the mission”, says on the scientific paper.
The scientific paper also states that “Mars is the next step in the journey to the Universe.” As examples of that will, it points out the European Space Agency (ESA) and NASA’s Red Dragon program. The latter is actually a partnership with SpaceX, the company of Elon Musk, the billionaire who already publicized the desire to colonize Mars with one million people in less than 100 years.
In March 2016, for the first part of ExoMars, the Trace Gas Orbiter probe and the Schiaparelli landing module was launched. But Schiaparelli eventually crashed into Martian soil, known as a cemetery of space devices. Before this end, the company Airbus Defense and Space began to build the rover for the second part of the program.
Last year, the then President of the United States, Barack Obama, said he wanted to send humans to Mars by 2030 and make them return to Earth safely. In April of this year, Donald Trump, the current US President, confessed that he would like to see Americans on Mars from three to seven years from now. Earlier this month, he instructed NASA to take astronauts to the moon to look at Mars. Vice President Mike Pence had already spoken about the change of plans. “NASA astronauts will return to the Moon. not only to leave footprints and flags but to build the bases we need to send Americans to Mars and beyond”, he told the National Space Council, which was resurrected with a ceremony at the Smithsonian National Air and Space Museum (Virginia).
Going back to plasma technology, it may be the key to getting back to witness astronauts on another solo beyond the lunar. Even just inside a small space station on Mars. “We started thinking about it almost like kids pretending to be astronauts”, tells Vasco Guerra. He adds that the project started by using plasma to decompose carbon dioxide on Earth into applications related to other challenges, such as climate change and the growing production of renewable energy. “But as we continued to think about it [creating oxygen on Mars], we began to realize that maybe it was a good idea.”
The PREMiERE project intends to use carbon dioxide on Earth as a raw material to make fuel and it has led to an interplanetary project. The inspiration came during a lecture of Dava Newman, then deputy administrator of NASA, about future missions to Mars. “During the lecture, I realized that it might be possible to adapt the knowledge acquired in the PREMiERE project in some way”, confessed Vasco Guerra.
The IPFN team is, with other researchers from IST and the University of Porto, developing what Vasco Guerra explains to be the theory. Meaning the models and simulation of the entire process. In turn, the University of Paris has been doing CO2 decomposition experiments and the Technological University of Eindhoven (Netherlands) is also collaborating on the research. The