On November 17, 1970, the Soviet spacecraft Luna 17 delivered the lunar rover Lunokhod 1 onto the surface of the moon. For 11 months after, controlled in real-time by a human team in Moscow, it explored seven miles of the lunar surface. Sending back reams of data, it was considered to be one of the biggest successes of the little-known Soviet lunar exploration program. And then, it disappeared. It wasn’t abducted or anything, it just ceased transmitting, as space probes have a tendency to do. This spring, NASA's Lunar Reconnaissance Orbiter spied it on the moon’s surface. The really neat thing: it can still reflect laser beams back to Earth as if it were brand new.