1998Mars Global Surveyor 2 (water, volatiles, climate) (U.S.) Planet B (solar environment interaction) (Japan)
1999Surface lander lab near south pole (search for surface water, volatiles) (U.S.)
2001Mars Global Surveyor 3 (geochemistry and climatology) (U.S.) Mobile Surface Exploration Lab (exploring ancient Mars) (U.S.) Orbiter and lander (Japan)
2003Sample return or gather samples for future mission (U.S.)
2005Return to Earth of material from surface (U.S.)
2011Human exploration of the surface? (International)