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This earth from space photo comes from a digitally enhanced, 1972 NASA Apollo 16 Mission negative – one of the last manned flights at this distance – 10,000 miles, or 16,000 kilometers (Credit: Royce Bair via Flickr)

This earth from space photo comes from a digitally enhanced, 1972 NASA Apollo 16 Mission negative - one of the last manned flights at this distance - 10,000 miles, or 16,000 kilometers (Credit: Royce Bair via Flickr)