Space
Island Group
First
objective: modify the shuttle's external tank (ET) so
as to use it as module for the space station
Dual-ET vehicle : launcher with one fuel-filled tank,
two boosters, and one modified tank carrying cargo and
crew to low Earth orbit
Estimated cost: $2 billion
Second
objective: use a variation of the Delta Clipper to build
passenger-carrying shuttles
Estimated cost: $2-3 billion
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