Carl Sagan: One Scientist, One Imagination, One Dot

Today is the 25th anniversary of the Pale Blue Dot, one of the most famous images of our planet. Carl Sagan convinced NASA to turn the camera of Voyager I toward Earth during its long exit from our solar system. Barely visible from six billion kilometers, the low-tech rendition of our home is almost lost in the spectrum of rays produced by the sun. But the .12 pixel image is an enduring reflection on science and imagination.

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