NASA is trying to connect her recorder Mars last time before dropping out.
The router is silent for eight months, sacrificing one of the most intense dust storms in decades. Thick powder clouded the sky last summer and for months it blocked the sunlight from the solar panels of the spacecraft.
NASA announced on Tuesday it will issue the latest series of recovery commands, over 1,000 already sent.
If there is no answer to the middle – NASA suspects will happen – The opportunity will be declared dead, 15 years after the red planet arrives.
Team members are already looking back at Opportunity's achievements, including the confirmation water that once flowed to Mars.
Possibility was the longest landmark on Mars. In addition to stamina, the six-wheeled revolver set a roaming record of 45 kilometers.
Her identical twin, the Spirit, has been declared dead in 2011, a year after it hit the sand and the communication stopped.
Both survived and surpassed the expectations of the opposite sides of Mars.
Large golf cart carts are designed to work as geologists for only three months after they rocked our planetary neighbor in the interior of the airbags in January 2004.
It's no easier to say goodbye to Opportunity than to Spirit, "said project manager John Callas.
"It's just like a loved guy who's gone, and you still hope that they will appear and that they're healthy," he said.
"But every passing day is diminishing and at one point you have to say" enough "and go on with your life.
Instead of looking at the dust storm as a bad luck, Kallas believes that "luck that we have gone through so many possible storms" over the years.
Global dust storms are usually launched every few years and "we spent a long time without it".
Unlike NASA's nuclear apparatus, which is still on Mars, Opportunity and Spirit have never been designed to withstand such a difficult time.
NASA last heard from Opportunity on June 10. Flight controllers tried to awaken the rover, inventing and sending command after command, month after month.
The Martian sky finally cleared enough to reach the sunlight at the solar panels of the Rover, but there was still no answer.
Now on Mars it is getting colder and darker, further darkening.
Engineers suggest that the internal clock on the rifle may have shaken during a prolonged stay, which interrupts the sleep cycle and the leakage of the batteries.
Especially disappointing, according to Kallas, not knowing exactly why Opportunity – or Spirit – failed.
It now depends on the curiosity and the newly arrived InSight Lander to continue the legacy, he noted, along with a spacecraft in orbit around Mars.