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Homage to Mercury and Mars

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The transit of Mercury in front of the Sun. For several hours on May 9, 2016, the planet Mercury will appear like a tiny black disk silhouetted against our star. Contacts are when the edge of Mercury’s disk and that of the Sun seem to touch.
Photo: Planétarium Rio Tinto Alcan (M. Jobin, d'après F. Espenak/EclipseWise.com)

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