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[music] Narrator: On August 21, 2017, 

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a solar eclipse will pass over all 50 United States. 

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This will afford most of the country a glimpse 

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 casting a shadow on us down below.

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The experience will look different depending on where you are located. 

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If you are along the path of totality, you see the moon fully block the sun. 

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If you are outside of the path, you will see the moon go by,

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, but the sun will never be fully covered.

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Wherever you are, you never want to look directly at the sun without protection, 

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like eclipse glasses (not sunglasses). 

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The one exception is if you are able to see totality. 

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Only when the moon has fully blocked the sun, you are safe to look at the eclipse directly. 

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Before and after that moment, keep your eyes protected.

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Events like this are rare. 

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The last total solar eclipse to cross the U.S. coast-to-coast was in 1918, 

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and the next total solar eclipse in the continental U.S. isn’t until 2024.

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Don’t miss this opportunity to experience a solar eclipse! Learn more at eclipse2017.nasa.gov

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music

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tone

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beeping