This patch was made by AB Emblems, the NASA contractor for mission emblems. It is 4 inches in diameter.

The crew of STS-125 performed history-making, onorbit "surgery" on two important science instruments aboard the Hubble Space Telescope. With the Space Telescope Imaging Spectrograph (STIS) and Advanced Camera for Surveys (ACS) still in place in Hubble, spacewalkers will for the first time ever, attempt to repair an instrument on orbit.

Neither instrument was designed to be fixed on orbit and neither has astronaut-friendly features. Hubble engineers and the astronauts worked diligently to design special tools, crew aids and procedures to accommodate this situation.

The 13-day mission made the Hubble more capable than ever before. In addition to the attempted repair of STIS and ACS, spacewalking astronauts installed the powerful new Wide Field Camera 3 (WFC3) and Cosmic Origins Spectrograph (COS), replace a fine guidance sensor, all six batteries, and all six of the telescope’s gyroscopes, add new thermal coverings, and install a soft capture mechanism on the aft bulkhead of the Hubble.

The Hubble Space Telescope, orbits 353 miles (569 km) above the surface of the Earth. The space shuttle Discovery launched the telescope into orbit in 1990.

It was the first telescope designed to be visited in space by astronauts to perform repairs, replace parts, and update its technology with new instruments. With each servicing mission, Hubble's power increases, making it one of the most enduring and successful space missions ever undertaken.

There have been four previous servicing missions to Hubble: Servicing Missions 1, 2, 3A and 3B. The upcoming Servicing Mission 4 (SM4) scheduled for October 2008 will be the final trip to Hubble. The astronauts’ goals for SM4 are to install new instruments, replace degraded systems, and bring inactive instruments back to life.