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This would be a good place to start a discussion about repairing and using the hundreds of Centaur Rockets that are in disposal orbits just beyond Geosynchronous Orbit. They all have simlar H2 - LOX engines which could be used for spare parts to repair the better ones, and LOX from the moon and H2 from earth will be available about the same time a repair factory could be put in place. The result is free rocket engines already in space. 198.203.213.110 (talk) 23:16, 13 May 2015 (UTC)[reply]