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Man must explore, and this is exploration at its greatest

Problems look mighty small from 150 miles up

I believe every human has a finite number of heartbeats. I don't intend to waste any of mine.

Science has not yet mastered prophecy

We predict too much for the next year and yet far too little for the next ten.

Failure is not an option

Many say exploration is part of our destiny, but it’s actually our duty to future generations.