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)