This Dec.1972 photo released by NASA shows a view of the Earth as seen by the Apollo 17 crew traveling toward the Moon.
This Dec.1972 photo released by NASA shows a view of the Earth as seen by the Apollo 17 crew traveling toward the Moon. AP file, 2007
This Dec.1972 photo released by NASA shows a view of the Earth as seen by the Apollo 17 crew traveling toward the Moon. AP file, 2007

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April 20, 2017 8:38 PM

On Earth Day 2017, science goes on the march

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