Mars Direct
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Connections
Mars Society
Organization
Inspiration Mars Foundation
Entity
Space Exploration Initiative
Entity
World War II
Concept
Mars
Entity
George H. W. Bush
Person
NASA
Concept
asteroid
Entity
International Standard Book Number
Entity
carbon dioxide
Entity
White House
Concept
spaceflight
Entity
Phobos
Entity
Stanford University
Entity
SpaceX
Entity
Deimos
Entity
digital object identifier
Entity
Space Shuttle
Entity
Apollo program
Concept
nuclear reactor
Entity