The Phoenix Mars Lander spent five months studying the Martian northern plains, digging up scientific firsts along the way.
How do scientists study Earth from space? This video shows how scientists and engineers will monitor Mt. Saint Helens if it erupts again.
This animation shows how the rover, scheduled to launch in 2011, will land on the surface of Mars.
Take a behind-the-scenes tour of the Clean Room at NASA's Jet Propulsion Laboratory and see the construction of NASA's next mission to Mars.