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two-stage-to-orbit (TSTO)




Generally descriptive of a reusable launch vehicle that uses an air-breathing first stage and a separate or parallel, rocket-propelled second stage. Examples include Sanger's space plane and Boeing's Beta. An alternative TSTO concept is the Kistler K-1.


Related entry

   • single-stage-to-orbit


Related category

   • ROCKETS, MISSILES, AND LAUNCH VEHICLES