Read the latest: NASA Lands the Perseverance Rover on Mars

On Thursday afternoon, Perseverance, NASA’s most ambitious self-driving rover, will attempt the agency’s most challenging Mars landing. Perseverance is carrying a suite of science experiments that will search for signs of life, launch a drone helicopter, and record the planet’s audio for the first time. But conducting those experiments relies solely on whether “Percy” can stick the landing.

“I just want to say that landing on Mars is hard,” says Gregorio Villar, a systems engineer with Entry, Descent and Landing team at NASA’s Jet Propulsion Laboratory. Historically, about half of the Mars landings attempted by the US have failed, and Perseverance will be the largest rover to attempt it. The location complicates things, too: The rover is aiming for Jezero Crater, a dry remnant of what scientists believe was a river delta 3.5 billion years ago. “Typically, we try to go to kind-of-safe spots, like very flat areas that are not too scary,” says Villar. “But then that’s kind of boring for the scientists, right?”

Perseverance launched from Florida’s Cape Canaveral Air Force Station on July 30, but its journey really began about a decade ago. “There are literally thousands of people over 10 years who worked on this,” says Villar. The new technology aboard the craft was designed to make challenging landings more realistic—and more intriguing Mars missions possible.


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This mission primarily centers around searching for ancient traces of life. Once in the crater, Perseverance will use tools like the Planetary Instrument for X-ray Lithochemistry to examine soil textures for patterns indicating past microbial activity. The self-driving rover is equipped with a first-ever microphone, plus 23 cameras, including the SuperCam, a laser and camera setup that will analyze the chemical makeup of martian dust and minerals, potentially revealing traces of long-ago life.

The rover also carries technologies unrelated to the search for extraterrestrials. Ingenuity, a little helicopter aboard Perseverance, will perform the first controlled flight on another planet—a Wright Brothers-esque moment for JPL. And the experiments get power from a battery that continuously recharges with US-made plutonium fuel.

Since July, as Perseverance has been cruising toward Mars, the numerous antennae aboard have been pinging high-frequency signals to engineers back on Earth. One signal in the X band has relayed a sort of “heartbeat” throughout the rover’s journey. “Every certain amount of seconds, it’ll be like, ‘OK, I’m still good, I’m still good,’” says Villar.

Separate ultrahigh-frequency signals in the megahertz range can also transmit heavier files, like images from Perseverance’s onboard cameras. The rover will communicate with satellites orbiting the Red Planet, and those will transmit its signals back to Earth. (NASA’s Mars Reconnaissance Orbiter, the Maven satellite, and their NASA cousins have new company: The United Arab Emirates’ Hope mission recently positioned a probe in orbit, which has sent back its first images.) These communication channels will continue pinging NASA on landing day.