Forty-one years ago, in 1972, the Apollo 17 astronauts whipped out their trusty Hasselblad medium format camera fitted with an 80mm lens, and took this image of our home. No manned space vehicles have since travelled this far into space to get a similar shot, and this view of a fully-illuminated Earth has become perhaps the classic Earth image and is usually known as "The Blue Marble" - for obvious reasons. To paraphrase Carl Sagan's "Pale Blue Dot"; this is where every human being that ever lived, good or evil, great or small, has called home. It's the only home we have, sailing serenely through space on an unknown journey - our blue marble ark.
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