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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.

Keywords

Organic Compound Irregular Shape Geological History Silicate Rock Grand Canyon 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Copyright information

© Springer Science+Business Media, LLC 2008

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