Word: retrorocket
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Dates: during 1990-1999
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...easy. The 1,300-lb. spacecraft will slam into the planet's atmosphere at 16,300 m.p.h., ultimately causing it to experience deceleration forces of 20 Gs. The vehicle's cork-and-silicon aeroshell should absorb most of this body blow. Both a parachute and a retrorocket will slow its plunge, and an array of airbags will inflate to cushion the shock of landing. And finally, the spacecraft will simply drop to the surface, striking the ground like a beach ball and rolling to a stop in the ancient floodplain...