The leading contender for a Hubble house call: a 3,664-pound, two-armed robot named Dextre. The robot, made by MD Robotics in Brampton, Canada, is about
the size of a small car and has multijointed arms equipped with a suite of lights, navigation cameras and repair tools. Originally designed for delicate repair work on the exterior of the International Space Station, Dextre already has most of the technology it would need to patch up the telescope. A retractable motorized socket wrench and handlike jaws, controllable by astronauts in orbit or on Earth, can grip objects from small tools to hardware up to 1,327 pounds. The chores include opening and closing toolboxes, changing batteries, and precisely positioning objects.