The SPHERES micro-satellites program, led by David Miller over at MIT is developing micro-satellites that are capable of formation flying. About the size of a volleyball, the spheres micro-satellites have been launched aboard the International Space Station on May 18th. Aimed at developing better robotic technology for orbital work the SPHERES program has developed technology in these small micro-satellites that uses ultrasound technology to determine the micro-satellites position and are able to maintain a position in space with only 0.4 inches of drift. During the test aboard ISS the satellites will use their thrusters and hunt down special beacons installed throughout the the station. Intresting to say the least this technology can lead to more complex versions of micro-satellites that are able to hunt down and repair other satilites as well as help automated docking systems which in the future could be used for missions to the Moon or Mars.