The Universe's Most Important Alarm Clock Will Wake Up Rosetta Tomorrow

Two and a half years is a long time to sleep—even for a machine. That's how long Rosetta has slumbered in its decade-long journey towards the comet where it will land. But in the dead of the night, at 2am PST tomorrow morning, Rosetta will awaken. Here's how its alarm clock works. » 1/19/14 12:00pm 1/19/14 12:00pm