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Many unknown bright objects, often without wings, no sound or any sign of exhaust, flying through our sky and they are often very hard to see with the naked eye. 

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These kinds of objects remain a mystery. Next clips show some of these hard-to-see objects. source: www.mufon.com

 

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      karen.c.fox@nasa.gov / molly.l.wasser@nasa.gov
      karen.c.fox@nasa.gov / molly.l.wasser@nasa.gov
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