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ESA: Mars Express
Mars Express is the European Space Agency's mission to Mars.
NASA: Mars Exploration Program
Includes information for kids, students and teachers.
NASA: Mars Exploration Rover Spirit
Landed on Mars in January 2004
Mars Global Surveyor
Mars Global Surveyor became the first successful mission to the red planet in two decades when it launched November 7, 1996, and entered orbit on September 12, 1997. It began its prime mapping mission in March 1999 and has studied the entire Martian surface, atmosphere, and interior, and has returned more data about the red planet than all other Mars missions combined.
The Mars Society
Working towards the exploration and settlement of Mars.