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Chuck Dayton
St. Paul, Minn.

40th anniversary of Earth Day

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Planet Earth
This photo of Earth was taken by the Apollo 17 crew on Dec. 7, 1972. It's widely known as "The Blue Marble."
Photo courtesy of Earth Sciences and Image Analysis Laboratory, NASA
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Planet Earth
This photo of Earth was taken by the Apollo 17 crew on Dec. 7, 1972. It's widely known as "The Blue Marble."
Photo courtesy of Earth Sciences and Image Analysis Laboratory, NASA