Websites are current as of August 6, 2012

NASA's 50th Anniversary

General Mission List (Past, Present, and Future)

Solar System Exporation (Past, Present, and Future)

2001 Mars Odyssey

Cassini Equinox Mission (Saturn Orbiter)

CloudSat (Studies Earth's Clouds)

Dawn (Dwarf Planet Ceres and Asteroid Vesta)

EPOXI Mission (Comet Hartley 2 and EPOCh Component [Extrasolar Planet Observation and Characterization])

Galaxy Exploration Explorer (Observing Galaxies in Ultraviolet Light)

Herschel Space Observatory

Jason 1

Jason 2 (Jason 1 Follow-up Mission)

Kepler (Search for Earth-like Planets)

Mars Exploration Program

Mars Exploration Rovers (Spirit and Opportunity)

Mars Express

Mars Reconnaissance Orbiter

MESSENGER (Mercury Orbiter)

MESSENGER - Geo Hunter (Interactive Website)

MESSENGER - Make a Mission (Interactive Website)

New Horizons (Pluto and the Kuiper Belt)

Phoenix Mars Lander (Mission Completed)

Spitzer Space Telescope (Studying the Universe in Infrared Light)

Stardust NExT (Exploring Comet Tempel 1)

Venus Express