<p>On August 21, 2017, millions of Americans will get the chance to see a total solar eclipse. Technically, this cosmic phenomenon isn't all that rare — an eclipse can be seen from somewhere on this planet every 18 months or so. But to be able to watch the moon blot the sun right out of the sky from your particular spot on Earth? Well, that happens only <a href="https://www.space.com/25644-total-solar-eclipses-frequency-explained.html" target="_blank">once in a lifetime</a>.</p>

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