What's a total solar eclipse and why this one is so unusual

Total solar eclipses occur every year or two or three, often in the middle of nowhere like the South Pacific or Antarctic. What makes the Aug. 21 eclipse so special is that it will cut diagonally across the entire United ...

Image: A partial solar eclipse seen from space

Thanks to a quirk of our cosmos, the moon's average distance from Earth is just right for it to appear as the same size in the sky as the significantly larger sun. Once in a while the moon slides directly between Earth and ...

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