Astronomers prepare for 2017 solar eclipse spectacle
On August 21, 2017, moon’s shadow will race across U.S. from Oregon to South Carolina

CROWNING MOMENT During a total solar eclipse in 2017, the moon will block the sun, allowing people to see the solar corona (as seen in this picture from a 1999 eclipse).
Luc Viatour/Wikimedia Commons (CC BY-SA 3.0)
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