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story.lead_photo.caption This photo made available by NASA shows the first image sent by the Perseverance rover showing the surface of Mars, just after landing in the Jezero crater, on Thursday, Feb. 18, 2021. (NASA via AP)

CAPE CANAVERAL, Fla. (AP) — A NASA rover streaked through the orange Martian sky and landed on the planet Thursday, accomplishing the riskiest step yet in an epic quest to bring back rocks that could answer whether life ever existed on Mars.

Ground controllers at the space agency's Jet Propulsion Laboratory in Pasadena, California, leaped to their feet, thrust their arms in the air and cheered in triumph and relief on receiving confirmation that the six-wheeled Perseverance had touched down on the red planet, long a deathtrap for incoming spacecraft.

"Now the amazing science starts," a jubilant Thomas Zurbuchen, NASA's science mission chief, said at a news conference, where he theatrically ripped up the contingency plan in the event of a failure and threw the document over his shoulders.

The landing marks the third visit to Mars in just more than a week. Two spacecraft from the United Arab Emirates and China swung into orbit around Mars on successive days last week. All three missions lifted off in July to take advantage of the close alignment of Earth and Mars, journeying some 300 million miles in nearly seven months.

Perseverance, the biggest, most advanced rover ever sent by NASA, became the ninth spacecraft since the 1970s to successfully land on Mars, every one of them from the U.S.

The car-size, plutonium-powered vehicle arrived at Jezero Crater, hitting NASA's smallest and trickiest target yet: a 5-by-4-mile strip on an ancient river delta full of pits, cliffs and rocks. Scientists believe if life ever flourished on Mars, it would have happened 3 billion-4 billion years ago, when water still flowed on the planet.

Over the next two years, Percy, as it is nicknamed, will use its 7-foot arm to drill down and collect rock samples containing possible signs of bygone microscopic life. Three to four dozen chalk-size samples will be sealed in tubes and set aside to be retrieved eventually by another rover and brought homeward by another rocket ship.

The goal is to get them back to Earth as early as 2031.

Scientists hope to answer one of the central questions of theology, philosophy and space exploration.

"Are we alone in this sort of vast cosmic desert, just flying through space, or is life much more common? Does it just emerge whenever and wherever the conditions are ripe?" deputy project scientist Ken Williford said. "We're really on the verge of being able to potentially answer these enormous questions."

China's spacecraft includes a smaller rover that will also seek evidence of life, if it makes it safely down from orbit in May or June. Two older NASA landers are still humming along on Mars: 2012's Curiosity rover and 2018's InSight.

Perseverance was on its own during its descent, a maneuver often described by NASA as "seven minutes of terror."

Flight controllers waited helplessly as the preprogrammed spacecraft hit the thin Martian atmosphere at 12,100 mph, or 16 times the speed of sound, slowing as it plummeted. It released its 70-foot parachute and then used a rocket-steered platform known as a sky crane to lower the rover the final 60 or so feet to the surface.

It took a nail-biting 11 minutes for the signal confirming the landing to reach Earth, setting off back-slapping and fist-bumping among flight controllers wearing masks against the coronavirus.

Perseverance promptly sent back two grainy, black-and-white photos of Mars' pockmarked, pimply-looking surface, the rover's shadow visible in the frame of one picture.

"Take that, Jezero!" a controller called out.

NASA said the descent was flawless and the rover came down in a "parking lot" — a relatively flat spot amid hazardous rocks. Hours after the landing, Matt Wallace, NASA deputy project manager, reported the spacecraft was in great shape.

Mars has proved a treacherous place for the world's spacefaring nations, the U.S. included. In the span of less than three months in 1999, a U.S. spacecraft was destroyed upon entering orbit because engineers had mixed up metric and English units, and an American lander crashed on the surface after its engines cut out prematurely.

President Joe Biden tweeted congratulations over the landing, saying: "Today proved once again that with the power of science and American ingenuity, nothing is beyond the realm of possibility."

NASA is teaming up with the European Space Agency to bring the rocks home. Perseverance's mission alone costs nearly $3 billion.

The only way to confirm — or rule out — signs of past life is to analyze the samples in the world's best labs. Instruments small enough to be sent to Mars wouldn't have the necessary precision.

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