The entire surface of planet Mercury has been mapped. Detailed observations of the innermost planet's surprising crust have been ongoing since the robotic MESSENGER spacecraft first passed Mercury in 2008 and began orbiting in 2011. Previously, much of the Mercury's surface was unknown as it is too far for Earth-bound telescopes to see clearly. The above video is a compilation of thousands of images of Mercury rendered in exaggerated colors to better contrast different surface features. Visible are rays emanating from a northern impact that stretch across much of the planet, while about half-way through the video the light colored Caloris Basin–an ancient impact feature that filled with lava–rotates into view. MESSENGER has now successfully completed its primary and first extended missions.
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