In November, the Rosetta mission's Philae lander was supposed to achieve the first-ever soft landing on a comet. That landing wasn't as soft as planned, though. Unable to anchor into the comet's surface, Philae ricocheted away from the nice, flat landing site that scientists had picked out for it, soaring at least half a mile until finally banging down in the shadow of what may be a jagged cliff. There, in the shade, Philae's solar panels haven't been able to collect enough sunlight to keep the power on. On November 15, the spacecraft went silent. But Philae was never actually dead, just hibernating—and now it has woken up.