FILE- This artist’s rendering provided to China’s Xinhua News Agency on Aug. 23, 2016 by the lunar probe and space project center of Chinese State Administration of Science, Technology and Industry for National Defense, shows a concept design for the Chinese Mars 2020 rover and lander. As Mars’ newest resident settles in, Planet Earth is working on three more landers and at least two orbiters to join the scientific Martian brigade. The Chinese Mars 2020 will feature both an orbiter and lander. NASA’s InSight, which touched down on Mars on Monday, Nov. 26 and is the eighth successful Martian lander, should be wrapping up two years of digging and quake monitoring by the time rovers arrive from the U.S., Europe and China. (Chinese State Administration of Science, Technology and Industry for National Defense via Xinhua via AP, File)

NASA rover finally bites the dust on Mars after 15 years

In the end, Opportunity outlived its twin by eight years

NASA’s Opportunity, the Mars rover that was built to operate for just three months but kept going and going, rolling across the rocky red soil, was pronounced dead Wednesday, 15 years after it landed on the planet.

The six-wheeled vehicle that helped gather critical evidence that ancient Mars might have been hospitable to life was remarkably spry up until eight months ago, when it was finally doomed by a ferocious dust storm.

Flight controllers tried numerous times to make contact, and sent one final series of recovery commands Tuesday night, along with one last wake-up song, Billie Holiday’s “I’ll Be Seeing You,” in a sombre exercise that brought tears to team members’ eyes. There was no response from space, only silence.

Thomas Zurbuchen, head of NASA’s science missions, broke the news at what amounted to a funeral at the space agency’s Jet Propulsion Laboratory in Pasadena, California, announcing the demise of “our beloved Opportunity.”

“This is a hard day,” project manager John Callas said at an auditorium packed with hundreds of current and former members of the team that oversaw Opportunity and its long-deceased identical twin, Spirit. “Even though it’s a machine and we’re saying goodbye, it’s still very hard and very poignant, but we had to do that. We came to that point.”

The two slow-moving, golf cart-size rovers landed on opposite sides of the planet in 2004 for a mission meant to last 90 sols, or Mars days, which are 39 minutes longer than Earth days.

In the end, Opportunity outlived its twin by eight years and set endurance and distance records that could stand for decades. Trundling along until communication ceased last June, Opportunity roamed a record 28 miles (45 kilometres) and worked longer than any other lander in the history of space exploration.

Opportunity was a robotic geologist, equipped with cameras and instruments at the end of a mechanical arm for analyzing rocks and soil. Its greatest achievement was discovering, along with Spirit, evidence that ancient Mars had water flowing on its surface and might have been capable of sustaining microbial life.

Project scientist Matthew Golombek said these rover missions are meant to help answer an “almost theological” question: Does life form wherever conditions are just right, or “are we really, really lucky?”

The twin vehicles also pioneered a way of exploring the surface of other planets, said Lori Glaze, acting director of planetary science for NASA.

She said the rovers gave us “the ability to actually roll right up to the rocks that we want to see. Roll up to them, be able to look at them up close with a microscopic imager, bang on them a little bit, shake them up, scratch them a little bit, take the measurements, understand what the chemistry is of those rocks and then say, ‘Oh, that was interesting. Now I want to go over there.’”

Opportunity was exploring Mars’ Perseverance Valley, fittingly, when the fiercest dust storm in decades hit and contact was lost. The storm was so intense that it darkened the sky for months, preventing sunlight from reaching the rover’s solar panels.

When the sky finally cleared, Opportunity remained silent, its internal clock possibly so scrambled that it no longer knew when to sleep or wake up to receive commands. Flight controllers sent more than 1,000 recovery commands, all in vain.

With project costs reaching about $500,000 a month, NASA decided there was no point in continuing.

Callas said the last-ditch attempt to make contact the night before was a sad moment, with tears and a smattering of applause when the operations team signed off. He said the team members didn’t even bother waiting around to see if word came back from space — they knew it was hopeless.

Scientists consider this the end of an era, now that Opportunity and Spirit are both gone.

Opportunity was the fifth of eight spacecraft to successfully land on Mars, all belonging to NASA. Only two are still working: the nuclear-powered Curiosity rover, prowling around since 2012, and the recently arrived InSight, which just this week placed a heat-sensing, self-hammering probe on the dusty red surface to burrow into the planet like a mole.

Three more landers — from the U.S., China and Europe — are due to launch next year.

NASA Administrator Jim Bridenstine said the overriding goal is to search for evidence of past or even present microbial life at Mars and find suitable locations to send astronauts, perhaps in the 2030s.

“While it is sad that we move from one mission to the next, it’s really all part of one big objective,” he said.

___

The Associated Press Health & Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content.

Marcia Dunn, The Associated Press

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