Astronaut F. Story Musgrave, anchored on the Space Shuttle Endeavor's robotic arm, prepares to be elevated to the top of the Hubble Space Telescope during Hubble's first servicing mission in 1993. Astronaut Jeffrey Hoffman, inside the shuttle payload bay, assists Musgrave. Hubble's first servicing mission replaced and repaired various instruments, but its most important task was installing technology that corrected the tiny flaw in Hubble's main mirror that distorted the telescope's view. Hubble was specially designed to be repaired and upgraded by astronauts while in orbit.