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Reagan's imagery might have worked when we lived on a mostly unexplored planet

In the 80s, I'm pretty sure the planet was mostly explored.

Ayup I gotta go along with ya on that one. Voted it up. :-)
It was only explored in a gross sense. As a measure of this, it's estimated that we only know of between 2/5ths and 1/15th of all species (http://www.enviroliteracy.org/article.php/58.html). The oceans, which comprise 95-99% of the living space on the planet by volume (Bill Bryson, A Short History of Nearly Everything), are almost completely unknown. There are still places to go to get away from things.