Mankind's rarest view: Earth from afar

It's appropriate that for Earth Day we be reminded how fragile a planet we live on. It may seem huge and invincible, but that's only because we're so small and small-minded. So we should listen to the people who have seen our planet from a different point a view and have been changed by it:

“It’s hard to appreciate the Earth when you’re down right upon it because it’s so huge.

“It gives you in an instant, just at a position 240,000 miles away from it, (an idea of) how insignificant we are, how fragile we are, and how fortunate we are to have a body that will allow us to enjoy the sky and the trees and the water ... It’s something that many people take for granted when they’re born and they grow up within the environment. But they don’t realize what they have. And I didn’t till I left it.”
—Jim Lovell, Apollo 8 and 13.