By Associated Press
Andrew Feustel, left, and John Grunsfeld work to upgrade the Hubble Space Telescope during a spacewalk, Monday, May 18, 2009.
The Atlantis astronauts plan to release the space telescope Tuesday. The shuttle is scheduled to land Friday at the Kennedy Space Center.
Hubble Fact: Hubble completes one orbit around the Earth (crossing over the same longitude line) every 96 minutes. Its speed is approximately 8 km per second (5 miles per second).