December's full moon is not until tomorrow (17 DEC 2013). According to data from the
United States Naval Observatory, 96% of the moon's visible surface was illuminated last night. Although this is not a particularly sharp image, many of the moon's recognizable features are visible.
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Moon at 96% visibility |
If we divide the moon in half from top to bottom, the left half of the moon is dominated by dark "seas" or
maria (from the Latin
mare for "sea"). These "seas" are actually flat plains made of dark basalt, a volcanic rock. The
Mare Tranquillitatus or "Sea of Tranquility" was the site of the Apollo 11 moon landing.
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Maria of the Moon |
The white areas that surround the
maria are called the lunar highlands or
terrae (from the Latin
terra for "land"). The highlands are formed of older rock than the
maria pitted with impact craters. Some of these craters can be seen in the photograph below - especially three craters on the dark
maria. These three craters appear as bright spots on the otherwise dark basaltic surface.
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Three lunar impact craters |
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