A pressurized Mars rover is a sealed, air-filled cabin on wheels where two astronauts can live in ordinary clothes for weeks, drive at around 10 km/h and, in NASA's prototype, step outside through suitports instead of an airlock. None has left Earth yet. NASA's 12-wheeled Space Exploration Vehicle, built for two crew and 14 days, was tested in the Arizona desert, and Japan's Toyota-designed Lunar Cruiser is planned to prove the idea on the Moon first. Mars Rally Championship, a free browser rally game, lets you drive one at rally pace.
What a pressurized Mars rover actually is
A pressurized rover carries its own atmosphere. Life support keeps breathable air in the cabin, scrubs carbon dioxide and manages heat, because Mars supplies almost nothing: surface pressure averages about 6 millibars, roughly 0.6% of Earth's, and the air is about 95% carbon dioxide.
That makes it a spacecraft that happens to drive. A spacesuit is a one-person pressure vessel with stiff joints and hours of consumables; a pressurized cabin lets two people eat, sleep and work in their own clothes, and suit up only when a job outside justifies it.
The driving itself, at 38% gravity with a horizon about three kilometres away, is covered in what it would be like to drive on Mars. The vehicle around the driver is the harder problem.
Why the first home on Mars may be a rover
In one NASA concept for a crewed Mars landing, the pressurized rover is the house. A NASA Mars Architecture Team study of a 30-day, minimal-infrastructure mission lists three landers, an ascent vehicle, an unpressurized rover and a pressurized rover the crew lives in for the whole stay, with a fission reactor to recharge the rovers.
The reason is partly medical. Describing the concept in 2022, NASA's director of space architectures, Kurt Vogel, put four astronauts on the trip and two on the surface, both deconditioned by months of weightlessness. A rover lets them explore sitting down, and walk in suits once their bodies have adjusted to 38% gravity.
NASA's older Design Reference Architecture 5.0, from 2009, housed the crew in a central habitat and sent two small pressurized rovers on one- to two-week excursions. The 30-day concept folds the house into the car.
NASA's pressurized rover prototype: the Space Exploration Vehicle
The Space Exploration Vehicle is the pressurized rover NASA built and drove. It began in 2008 as the Lunar Electric Rover and was developed until 2015 as a multi-mission cabin that could ride a wheeled chassis on the Moon or Mars, or fly to an asteroid.
The surface version is about the size of a pickup truck, on 12 wheels that pivot through 360 degrees, so it can crab sideways or turn on the spot. It houses two astronauts for up to 14 days, with sleeping and sanitary facilities, and drives at about 10 km/h, according to NASA's Space Exploration Vehicle fact sheet; the chassis was built to climb 40-degree slopes. In 2009 it carried two crew through a simulated two-week lunar mission in the Arizona desert.
Toyota's Lunar Cruiser is meant to test the idea on the Moon first
The first pressurized rover to carry people on another world will probably drive on the Moon. Under an April 2024 agreement, Japan designs, builds and operates it, NASA delivers it to the Moon, and Japanese astronauts get two opportunities to land. NASA's page on the Artemis pressurized rover describes two astronauts living and working in it for up to 30 days, and the agreement planned its use from Artemis VII onward, over about ten years.
Toyota and JAXA began developing it in 2019, and it has since been nicknamed the Lunar Cruiser, after Toyota's Land Cruiser. The 2019 concept was 6.0 m long, 5.2 m wide and 3.8 m tall, with 13 m³ of living space for two people, or four in an emergency, and fuel cells from Toyota's hydrogen cars for a total range of more than 10,000 km.
Crewed Mars rover designs compared
| Vehicle | Status | Cabin | Crew and time out | Top speed | Power |
|---|---|---|---|---|---|
| Apollo Lunar Roving Vehicle | Flew on Apollo 15–17, 1971–72 | Open; crew in spacesuits | 2, one moonwalk at a time | ≈13 km/h | Two non-rechargeable silver-zinc batteries |
| NASA Space Exploration Vehicle | Earth prototype, 2008–2015 | Pressurized, shirt-sleeve | 2, up to 14 days | ≈10 km/h | Electric |
| NASA Mars pressurized rover studies | Concepts, 2018–2022 | Pressurized; the crew's only home in the 30-day plan | 2, three weeks to 30 days | — | Batteries, recharged by a 10 kW fission reactor |
| Toyota–JAXA Lunar Cruiser | In development; 2024 plan: Artemis VII | Pressurized, 13 m³ | 2, or 4 in an emergency; up to 30 days | — | Hydrogen fuel cells |
| Mars Rally Championship rover | Free browser game | Pressurized canopy, one suited driver | 1 driver, one stage at a time | 240 km/h clamp | 90 kWh battery, 150 kW regen |
The two that have carried crews, the Apollo rover and the SEV, top out at 10 to 13 km/h, and every real pressurized design here seats two for two to four weeks. Averages run lower: Apollo 17's rover covered about 36 km in roughly four and a half hours of driving, about 8 km/h while moving. An older NASA concept for a three-person Mars rover allowed 20 km/h on good ground, over six-day sorties with a 100 km range. A dash means no published figure.
Suitports: getting outside without bringing Mars in
A suitport turns the spacesuit into the door. A rear-entry suit is sealed by its back to the outside of the hull; the astronaut climbs in feet first from the cabin, closes the backpack and the hatch, and undocks. NASA's fact sheet puts suit-up and exit through the SEV's suitports at under 10 minutes, with minimal gas loss.
The bigger prize is dust: the suit never comes inside, so neither does anything stuck to it. On Apollo 17, dust carried into the lunar module on the crew's suits gave Harrison Schmitt what he called "lunar hay fever".
Martian dust adds chemistry. Phoenix measured perchlorate at about half a percent of the soil by weight, Curiosity found it in Gale Crater too, and perchlorate interferes with the thyroid. No sample of Martian dust has yet come back to Earth to be tested.
How would astronauts drive on Mars?
From a seat, in their own clothes, with their own hands on the controls. A crew on the surface removes the light-time delay that makes robotic rovers plan every drive from Earth — how fast Mars rovers go explains why Perseverance moves at centimetres per second — so a crewed rover can drive continuously and react as it goes.
They would still drive slowly. NASA's prototype is built for about 10 km/h and for looking as much as moving: a bubble window low in its nose and a chassis that kneels let the crew study the rocks just ahead without suiting up.
Radiation, power and range decide the design
Radiation: shelter from storms, not from the sky
Curiosity measured about 0.67 millisieverts a day at Gale Crater between August 2012 and June 2013, mostly from galactic cosmic rays. Those are hard to stop with any mass a rover can carry; solar particle storms are not, so the SEV's heavily shielded cabin doubles as a storm shelter for up to 72 hours.
Power: why the 30-day plan went nuclear
Mars gets about 586 watts of sunlight per square metre above its atmosphere, 43% of Earth's, and a dust storm can take most of it — the failure that ended Opportunity, told in Mars dust storms explained. A crew needs kilowatts day and night, so the 30-day concept recharges its rovers from a 10-kilowatt fission reactor, which the study says was chosen for its resilience to dust storms.
Range: past walking distance on purpose
Apollo planned every rover drive around a walkback limit: if the rover failed, the crew had to reach the lander on foot with what their backpacks had left, and Apollo 17's rover never went more than 7.6 km from its lander. A pressurized rover exists to go farther, so the fallback becomes a second vehicle: DRA 5.0 carried two pressurized rovers and still held traverses to about 50 km from the landing site, close enough for a crew to get back if one failed. The 30-day concept's power analysis adds up to 194 km of driving over 279 hours away from the recharging point. How far that could stretch — up the solar system's largest volcano, say — is the question behind could you drive up Olympus Mons.
What Mars Rally Championship models, and what it leaves out
In Mars Rally Championship you drive a pressurized rover at the limit of grip rather than the limit of caution. Its only vehicle is electric, 3,000 kg, with a 90 kWh battery and up to 150 kW of regenerative braking. The game's changelog describes a pressurized cabin under a wraparound glass canopy with a suited driver, and the model seats that driver alone on the centreline; the DASH camera looks out from inside.
Where a real Mars vehicle's constraints touch the driving, the game keeps them: motor power is derated because radiators barely work in air this thin, a dust storm raises battery drain 50% as the panels dim, and grip is Mars grip — about 3.1 m/s² in total, or about 125 metres and 9 seconds to stop from 100 km/h, as braking distance on Mars vs Earth shows.
Where it departs, it departs on purpose. The speed clamp is 240 km/h, stages run against a clock, and one driver sits where every real design carries at least two. The game does not simulate life support, cabin pressure, radiation or suitports: damage lives in four pools — chassis, suspension, motor and battery — so a crash can cost battery capacity, never cabin air. The terrain is sculpted to Martian morphologies, not surveyed from a real place.
Where to try this
- Free roam has no timer and no checkpoints: press C (B on a gamepad) to cycle to the DASH camera and drive from inside the cabin.
- Stage 2, "The Long Run" is the game's longest timed line: 2,306 m over 12 checkpoints, with up to 369 m between gates.
- Mars Rally Championship is free in a browser tab, with no download and no account, on a laptop, a school Chromebook or a phone held in landscape.