The Milky Way over Monument Valley

Explanation: You don’t have to be at Monument Valley to see the Milky Way arc across the sky like this — but it helps. Only at Monument Valley USA would you see a picturesque foreground that includes these iconic rock peaks called buttes.

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Mercury as Revealed by MESSENGER

Explanation: Mercury had never been seen like this before. In 2008, the robotic MESSENGER spacecraft buzzed past Mercury for the second time and imaged terrain mapped previously only by comparatively crude radar.

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