Last year's failure of the composite liquid hydrogen tank for the X-33 reusable launch vehicle testbed doesn't necessarily mean lightweight composite tanks can't handle cryogenic propellants in future spacecraft, industry and government experts agree. NASA and Lockheed Martin Skunk Works are still wrangling over what to do about the X-33 tank failure, which halted work on the X-33 and delayed a first flight indefinitely. The company has studied replacing the composite hydrogen tanks ...

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