A presentation was made recently at the Future In-Space Operations (FISO) Working Group Telecon titled "SPHERES Overview" by Dr. Alvar Saenz-Otero, MIT SPHERES Lead Scientist. SPHERES (Synchronized Position Hold Engage and Reorient Experimental Satellites) provide researchers with a long term, replenishable, and upgradable testbed for the validation of high risk metrology, control, and autonomy technologies for use in formation flight and autnomous docking, rendezvous and reconfiguration algorithms.