Preston Burch at the Hubble 25th Anniversary event for employees at Goddard Space Flight Center

Preston Burch, Hubble Program Manager, speaks during a press conference on the upcoming Hubble Space Telescope servicing mission, Thursday, April 23, 2009, at NASA Headquarters in Washington. Photo Credit: (NASA/Paul. E. Alers)

Preston Burch, left, Hubble Spece Telescope Program Manager presents Prince Philip with three solar cells returned from space during the first HST servicing mission. Photo Credit: (NASA/Chris Gunn)

Ed Weiler, Associate Administrator, Science Mission Directorate at NASA Headquarters, left, looks on at David Leckrone, Hubble Project Scientist, as he speaks during a press conference on the upcoming Hubble Space Telescope servicing mission while Preston Burch and Mike Klenlen, seated right, look on, Thursday, April 23, 2009, at NASA Headquarters in Washington. Photo Credit: (NASA/Paul. E. Alers)

Ed Weiler, Associate Administrator, Science Mission Directorate at NASA Headquarters, seated second from left, speaks during a press conference on the upcoming Hubble Space Telescope servicing mission as David Leckrone, Hubble Project Scientist, Preston Burch and Mike Klenlen, seated right, look on, Thursday, April 23, 2009, at NASA Headquarters in Washington. J.D. Harrington, Public Affairs officer for the Science Mission Directorate looks on at left. Photo Credit: (NASA/Paul. E. Alers)

Ed Weiler, Associate Administrator, Science Mission Directorate at NASA Headquarters, second from left, speaks during a press conference on the upcoming Hubble Space Telescope servicing mission as David Leckrone, Hubble Project Scientist, Preston Burch and Mike Klenlen, seated right, look on, Thursday, April 23, 2009, at NASA Headquarters in Washington. Photo Credit: (NASA/Paul. E. Alers)