Unfortunately, though, that’s just what happened to the Deep Space Network’s 70-meter dish antenna at Goldstone, California. NASA announced the outage this week, but the accident that damaged the dish occurred much earlier, in mid-September. The three sites are located roughly 120 degrees apart on the globe, which gives the network full coverage of the sky regardless of the local time. Training a robot is all well and good, but how about training them how to move around inside a house made for humans? The Earth-based process uses ammonia as a nitrogen source, but in orbit or on long-duration deep-space missions, urea harvested from astronaut pee would be used instead.