FILE - In this May 20, 2012, file photo, the annular solar eclipse is seen as the sun sets behind the Rocky Mountains from downtown Denver. The solar eclipse that is cutting a diagonal path across the U.S. next month is a boon for Missouri tourism. Some towns will have more visitors than residents on Aug. 21, 2017. Hotels and campsites are sold out as some communities are preparing for unparalleled numbers of visitors, all to observe about two minutes of near-darkness at the height of the day. (AP Photo/David Zalubowski, File)
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