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Gregory new work looks at applying the SpaceX Falcon Heavy and a 700 meter by 700 meter square solar sail.
Above – A SpaceX Dragon V2 and a larger Bigelow 330 module. 330 cubic meters versus 16 cubic meters for the BEAM module. A SpaceX BFR and BFS would be able to make interplanetary missions with Bigleow 330 modules. The BFS would already have 825 cubic meters of volume.
Matloff describes a manned mission to near earth asteroids.
The Dragon version 2 has 10 cubic meters of pressurized volume and the Bigelow Beam has 16 cubic meters of volume inside.
The Apollo command and service module had 6.2 cubic meters of volume.
The possibility of applying the Space-X Falcon-Heavy booster to human exploration of the inner solar system is discussed. A human-rated Dragon command module and an inflatable habitat module would house and support the 2-4 person crew during a ~1 year interplanetary venture. To minimize effects of galactic cosmic rays, older astronauts should conduct the mission during Solar Maximum.