Planetary surface of Mars.
1During these tests, we followed tele-science work flows pertinent to Mars surface missions in a simulated spaceflight environment.
2The Phoenixlanded last night after a plunge through the planet's thin atmosphere and thruster-jet landing to the Mars surface.
3The crew would release three 2.36-ton Mars Surface Sample Return (MSSR) landers on 30 December 1977, five days before closest Mars approach.
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