ULA Proposes On-Orbit Gas Stations for Space Exploration
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Graham Warwick
United Launch Alliance (ULA) is proposing on-orbit propellant depots to increase the capability of NASA’s Constellation exploration architecture. The plan to use depots derived from an advanced upper stage for the Atlas V and Delta IV evolved expandable launch vehicles (EELV) has caught the attention of the Augustine panel, which has included in-space refueling in four of seven options identified....
ULA Proposes On-Orbit Gas Stations for Space 
