An Edge of Darkness

The Earth’s terminator sweeps over us as certainly as death’s scythe, but more often. Twice every day the circular edge of darkness creates a twilight zone for each of us, a boundary between sunlit day and the hours of the night. Miranda, a small moon of Uranus, has a terminator, too, of which this image shows just a small portion.


Organic Compound Irregular Shape Geological History Silicate Rock Grand Canyon 

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© Springer Science+Business Media, LLC 2008

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