Aug. 24, 1993: The National Aeronautics and Space Administration (NASA) Mars Observer, which was launched Sept. 25, 1992, arrives at Mars.
November 1994: Russian Mars '94 launch will carry two landers and two surface penetrators.
1. Russian Mars '96 launch is tentatively scheduled, subject to funding, and will carry a surface rover vehicle and an instrumented balloon.
2. NASA's MESUR (Mars Environmental SURvey) Pathfinder spacecraft launch is scheduled, subject to budget approval, and will land and deploy a small rover vehicle.
3. Japan's Planet-B craft will be launched to orbit Mars.
1. Twelve NASA MESUR landers are expected to form a Mars surface instrument and seismographic network by 2003, if the program is approved.
2. The European Space Agency may send three or four landers to supplement NASA's MESUR network.