Crossing the Threshold

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Crossing the Threshold Five decades after Apollo 11 landed on the moon, we seek clean energy sources, a healthy environment, and a peaceful world.

Crossing the Threshold presents a vision of a secure, sustainable future--with abundant energy, resources, and opportunities. Norm Augustine: "Paul Wieland knows space from the bottom up...and presents a fresh and valuable perspective. I intended only to skim the book, but soon found myself deeply involved in reading it." Homer Hickam: "Crossing the Threshold is a carefully considered, insightful

narrative that should interest anyone and everyone who cares about the future of spaceflight." Jeff Foust: "not so much crossing a threshold [as] vaulting a discontinuity in space utilization." Henry Petroski: "Crossing the Threshold is a NASA veteran's thoughtful and considered look at the value of space travel and exploration, not only for satisfying humanity's seemingly unquenchable thirst for adventure and knowledge but also for preparing and positioning us technically to begin to solve some of the greatest problems facing us on Earth."

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