Space.com has an article about the new Robotic Automatic Astronomy. These robots scan the skies for asteroids and comets and are much more likely to locate them than humans. These robots are smart too... they can chart an asteroid's course and decide where to look next to find it again and can adjust for the weather and make other informed decisions. There are many various methods for autonomous robotic gizmos to scan the skies and there are various robotic contraptions being built for this purpose. These robots are cheaper and more effective than humans and can take the monotony out of astronomy.