Time To Ditch Old-Style Engines
Regarding J2X rocket engines for Ares launch vehicles and your In Orbit item “Billion-Dollar Baby” (AW&ST July 23, p. 15), it is an unfortunate result of the rush to return to the Moon and venture to Mars that the U.S. will spend $1.2 billion for eight engines, or $150 million each. This is an...
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