Spaceflight Insider

NASA’s Mars 2020 rover to produce oxygen on the Red Planet

Science Instruments on the Mars 2020 Rover

This 2015 diagram shows components of the investigations payload for NASA’s Mars 2020 rover mission. Image Credit: NASA

NASA’s Mars 2020 rover will not only investigate the Red Planet, searching for evidence of past life on Mars, but also it is expected to lay the foundations for future human exploration of the planet. One of the mission’s instruments, called MOXIE, will have a special task – testing technology essential for Mars colonization.

“MOXIE is one of nine instruments, but it is the only one that is relevant to human exploration,” Donald Rapp, one of the co-investigators of MOXIE, told

MOXIE stands for the Mars OXygen In-situ resource utilization Experiment. With a diameter of 9.4 by 9.4 by 12.2 inches (23.9 cm × 23.9 cm × 30.9 cm), the instrument will produce oxygen from the Martian carbon dioxide atmosphere at a rate of about 0.35 ounces (10 grams) per hour. It is a 1:100 scale test model of a future instrument that would be efficient for human explorers on Mars.

Mars 2020 Rover: Mars Oxygen ISRU Experiment (MOXIE) is an exploration technology investigation that will produce oxygen from Martian atmospheric carbon dioxide.

Mars Oxygen ISRU Experiment (MOXIE) is an exploration technology investigation that will produce oxygen from Martian atmospheric carbon dioxide. (Click to enlarge) Image Credit: NASA

“The object is not to produce a lot of oxygen. The object is to show that the process works on Mars. MOXIE produces only about 10 [grams] per hour of oxygen, less than one percent of full scale,” Rapp said.

Martian atmosphere is 96 percent carbon dioxide, and MOXIE will work just like a tree – inhaling carbon dioxide and exhaling oxygen. It will collect carbon dioxide from the atmosphere, compress and store it; then it will electrochemically split the carbon dioxide molecules into dioxygen and carbon monoxide. The dioxygen will then be analyzed for purity before being vented back out into the Mars atmosphere along with the carbon monoxide and other exhaust products.

MOXIE will consume up to 300 W of power and will operate at 800 degrees Celsius, requiring a sophisticated thermal isolation system, including input gas preheating and exhaust gas cooling. The instrument’s design includes technology to investigate dioxygen exhaust and carbon dioxide / carbon monoxide exhaust streams, which will be analyzed to verify the oxygen production rate and purity.

However, if MOXIE successfully completes its task, a future full-scale instrument will need to consume more resources to work properly.

“If MOXIE works well, scale-up is feasible. However, scaled up version will require considerable power,” Rapp noted.

A full-scale MOXIE-like instrument could be employed to produce oxygen on a larger scale, mainly for life-sustaining activities for humans. The system could also deliver liquid oxygen needed to burn rocket fuel for a return trip to Earth. Moreover, the carbon monoxide that will be also produced by the instrument may be utilized directly as fuel or converted to methane for use as propellant.

Meanwhile, MOXIE is in its early stages of development. The instrument has recently passed the Preliminary Design Review.

“The instrument passed Preliminary Design Review favorably and is scheduled for Critical Design Review in about six months. After that, we proceed to build and test the flight model,” Rapp revealed.

Mars 2020 mission is expected to deliver important information about the potential habitability of the Red Planet. Besides testing method for producing oxygen from the atmosphere, the rover is designed to identify other resources such as water, improve landing techniques, as well as characterize weather, dust, and other potential environmental conditions that could affect future astronauts on Mars.

The mission, managed by NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, California, is currently slated to be launched in July 2020, atop an Atlas V booster, from Cape Canaveral Air Force Station in Florida.



Tomasz Nowakowski is the owner of Astro Watch, one of the premier astronomy and science-related blogs on the internet. Nowakowski reached out to SpaceFlight Insider in an effort to have the two space-related websites collaborate. Nowakowski's generous offer was gratefully received with the two organizations now working to better relay important developments as they pertain to space exploration.

Reader Comments

It must be about time to bite the bullet and start developing the nuclear reactors which will be required to power the full scale model, otherwise it will all be a bit pointless.

⚠ Commenting Rules

Post Comment

Your email address will not be published. Required fields are marked *