"We tend to think of America's days of frontier exploration as being behind us, but that's because we tend not to think of the other 71% of our blue planet."

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Whenever I gaze up at the moon, I feel like I'm on a time machine. I am back to that precious pinpoint of time, standing on the foreboding - yet beautiful - Sea of Tranquility. I could see our shining blue planet Earth poised in the darkness of space.

— Buzz Aldrin