Can a goldfish truly understand its bowl without taking a look from the outside? We use our eyes and our machines to look to the stars, but when we peer back at ourselves, this is what we see. For more about Earth and its place in the universe, check out Neil deGrasse Tyson and National Geographic's new book "StarTalk":

1. "Blue Marble"

"Blue Marble"

The original “Blue Marble” photograph was taken from Apollo 17 on December 7, 1972, at a distance of 28,000 miles from Earth.


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