Space Shuttle Atlantis lifts off on a mission to deploy the orbiting Gamma Ray Observatory satellite. When the high-gain antenna fails to deploy on GRO, the first unplanned spacewalk since 1985 is conducted, with two of the astronauts manually releasing the antenna. Manning Atlantis for nearly six days are Commander Steven Nagel, Pilot Kenneth Cameron, and mission specialists Jerry Ross, Jay Apt and Linda Godwin.
