Hubble Space Telescope Servicing Mission 4 May 20, 2009

This May, a shuttle will launch from the Kennedy Space Center and dock with the Hubble Space Telescope 360 miles above the Earth, inaugurating the giant telescope's Servicing Mission 4 (SM4). The Exploratorium's Webcast team brings you live coverage of the mission's exhilarating spacewalks during which astronauts will install cutting-edge scientific instruments and replace gyroscopes, batteries, and other equipment. Important: Shuttle missions are subject to schedule changes; please check explo.tv for the latest information.