Now it's officially time to throw in the towel. The German Aerospace Center DLR announced Friday that it wouldn't send any more commands to the lander.
Rosetta will keep listening to the rover for another month or two, but scientists have given up. Temperatures on the comet, which is 138 million miles away from Earth, now dip below minus 292 Fahrenheit during the comet's night. That's too cold for the robot, even if it managed to get enough sunlight to power up.
"We still have the receivers on the orbiter on, we did not switch anything off," Philae project manager Stephan Ulamec told the AFP. "It's just, to be honest and to be realistic — it's really not likely that we will hear anything any more."