One of the small drones aboard the ISS taught itself how to go around station with just one eye, and it was a lot harder than you might think. For starters, the SPHERE drone (that's short for Synchronized Position Hold Engage and Reorient Experimental Satellite) learned on its own by using machine learning. That method isn't typically used for space applications, because if it fails, it could result in a costly catastrophe. This is the first time a drone in space employed the technique to teach itself. Robots also still can't judge distances between objects using just one camera. Plus, the drone was operating in microgravity, floating around in a place where there's no up or down.