NASA has issued a request for proposals (RFP) from U.S. companies capable of carrying out up to $7 billion in re-supply missions to its planned lunar-orbiting, human-tended Gateway. The request asks for a service similar to how multiple commercial providers deliver pressurized and unpressurized cargo to and from the six-person International Space Station (ISS) under commercial resupply services contracts. The major difference is that the ISS orbits in a high inclination orbit about 250 mi. ...


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