NASA Testing Robots for Satellite Refueling Missions
The whole concept of servicing satellites in space is just so crazy that with the very rare exception of bajillion dollar pieces of hardware like Hubble, satellites just aren't designed to be repaired or refueled. They get put into orbit, they last until they run out of fuel or suffer some other sort of basic malfunction, and then they just get forgotten about, left to one of any number of depressing fates: orbiting the Earth until the end of time, de-orbiting whenever they feel like it onto hopefully not someone's head, or having a violently destructive close encounter with a fellow satellite resulting in a chain reaction of debris that will increase exponentially until low Earth orbit turns into a shell of pointy metallic confetti that's just as deadly as you'd expect pointy metallic confetti to be.
But what if we could service satellites, hmm? NASA's been taking small steps toward the giant leap of making that possible.