May 31, 2010. The last shuttle mission.
NASA has 10 missions remaining for the shuttle fleet, which President Bush ordered to retire by Sept. 30, 2010. The schedule announced Monday includes five flights this year, five in 2009 and three in 2010.
The space agency has already begun work on developing a new spacecraft to send astronauts back to the moon.
Thank you, shuttle. Thank you, Hubble.