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Astronomy MagazineEnglish · 21 hours ago

Sept. 21, 1974: Mariner 10 flies by Mercury

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Sept. 21, 1974: Mariner 10 flies by Mercury

www.astronomy.com

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Astronomy MagazineEnglish · 21 hours ago

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Today in the history of astronomy, Mariner 10 has its second encounter with Mercury.

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