Hubble Space Telescope be kept in a clean room, powered up and purged with nitrogen, until a launch could be rescheduled. This costly situation (about per month) pushed the overall costs of the project even higher. This delay did allow time for engineers to perform extensive tests, swap out a possibly failure-prone battery, and make other improvements. Furthermore, the ground software needed to control Hubble was not ready in 1986, and was barely ready by the 1990 launch. Eventually, following the resumption of shuttle flights in 1988, the launch of the telescope was scheduled for 1990. On April 24, 1990, successfully launched the
Rendezvous: A Space Shuttle Simulation Rendezvous: A Space Shuttle Simulation Rendezvous: A Space Shuttle Simulation, is a space simulator published 1982 by Edu-Ware, and developed by Titan Computer Products and NASA scientist Wesley Huntress. Accompanied by a thick "Spacecraft Operations" manual with a chapter on use in the classroom, this flight simulator was marketed as being as educational as it was fun to play. The simulation is centered on a typical Space Shuttle mission to service a space station. Mission phases include "Earth Lift-Off", "Orbital Rendezvous", "Approach" and "Alignment and Docking". It was released for the Apple II in 1982 with positive feedback from reviewers.