Mars Missions

This June 1 rendering provided by Mohammed Bin Rashid Space Centre shows the Hope probe. The U.S., China and the United Arab Emirates are sending spacecraft to Mars in quick succession beginning this week.

CAPE CANAVERAL, Fla. — Mars is about to be invaded by planet Earth — big time.

Three countries — the United States, China and the United Arab Emirates — are sending unmanned spacecraft to the red planet in quick succession beginning this week, in the most sweeping effort yet to seek signs of ancient microscopic life while scouting out the place for future astronauts.

The U.S. is dispatching a six-wheeled rover the size of a car, named Perseverance, to collect rock samples that will be brought back to Earth for analysis in about a decade.

The UAE spacecraft, named Amal, which is Arabic for Hope, is an orbiter scheduled to rocket away from Japan on Wednesday. China will be up next, with the flight of a rover and an orbiter sometime around July 23.

; Chinese officials aren’t divulging much. The mission is named Tianwen, or Questions for Heaven.

NASA, meanwhile, is shooting for a launch on July 30 from Cape Canaveral.

Perseverance is set to touch down in an ancient river delta and lake known as Jezero Crater, not quite as big as Florida’s Lake Okeechobee. China’s much smaller rover will aim for an easier, flatter target.

To reach the surface, both spacecraft will have to plunge through Mars’ hazy red skies in what has been dubbed “seven minutes of terror” — the most difficult and riskiest part of putting spacecraft on the planet.

Jezero Crater is full of boulders, cliffs, sand dunes and depressions, any one of which could end Perseverance’s mission. Brand-new guidance and parachute-triggering technology will help steer the craft away from hazards. Ground controllers will be helpless, given the 10 minutes it takes radio transmissions to travel one-way between Earth and Mars.

Jezero Crater is worth the risks, according to scientists who chose it over 60 other potential sites.

Where there was water — and Jezero was apparently flush with it 3.5 billion years ago — there may have been life, though it was probably only simple microbial life, existing perhaps in a slimy film at the bottom of the crater. But those microbes may have left telltale marks in the sediment layers.

Perseverance will hunt for rocks containing such biological signatures, if they exist.

It will drill into the most promising rocks and store a half-kilogram (about 1 pound) of samples in dozens of titanium tubes that will eventually be fetched by another rover. To prevent Earth microbes from contaminating the samples, the tubes are super-sterilized, guaranteed germ-free by Adam Stelzner, chief engineer for the mission at NASA’s Jet Propulsion Laboratory in Pasadena.

“Yep, I’m staking my reputation on it,” he said.

While prowling the surface, Perseverance as well as China’s rover will peek below, using radar to locate any underground pools of water that might exist. Perseverance will also release a spindly, 4-pound (1.8-kilogram) helicopter that will be the first rotorcraft ever to fly on another planet.

Perseverance’s cameras will shoot color video of the rover’s descent, providing humanity’s first look at a parachute billowing open at Mars, while microphones capture the sounds.

The rover will also attempt to produce oxygen from the carbon dioxide in the thin Martian atmosphere. Extracted oxygen could someday be used by astronauts on Mars for breathing as well as for making rocket propellant.

NASA wants to return astronauts to the moon by 2024 and send them from there to Mars in the 2030s. To that end, the space agency is sending samples of spacesuit material with Perseverance to see how they stand up against the harsh Martian environment.

The tab for Perseverance’s mission, including the flight and a minimum two years of Mars operations, is close to $3 billion. The UAE’s project costs $200 million, including the launch but not mission operations. China has not disclosed its costs. Europe and Russia dropped plans to send a life-seeking rover to Mars this summer after falling behind in testing and then getting slammed by COVID-19.

Perseverance’s mission is seen by NASA as a comparatively low-risk way of testing out some of the technology that will be needed to send humans to the red planet and bring them home safely.

“Sort of crazy for me to call it low risk because there’s a lot of hard work in it and there are billions of dollars in it,” Farley said. “But compared to humans, if something goes wrong, you will be very glad you tested it out on a half-kilogram of rock instead of on the astronauts.”