This is what mercury looks like. Awe-inspiring-some isn't it?
This video is based on images taken by the MESSENGER probe, the first
spacecraft to actually orbit Mercury. It has allowed astronomers to get
the first up-close view at the planet's geology; until now, the sum
total of our knowledge was limited to a single Mariner flyby in 1975.
Over the past year, MESSENGER has taken over 80,000 images with plans to
take 80,000 more. That's allowed us to assemble this complete visual
representation of Mercury's surface, with each pixel representing about a
square kilometer.
Courtesy of the MESSENGER website, here's a breakdown of what the various colors represent in the video:
This view captures both compositional differences and differences in how long materials have been exposed at Mercury's surface. Young crater rays, arrayed radially around fresh impact craters, appear light blue or white. Medium- and dark-blue areas are a geologic unit of Mercury's crust known as the "low-reflectance material," thought to be rich in a dark, opaque mineral. Tan areas are plains formed by eruption of highly fluid lavas. The large circular area near the top center is the Caloris impact basin, whose interior is filled with smooth, somewhat younger volcanic plains. Small orangish spots are materials deposited by explosive volcanic eruptions.
Taken from io9
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