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Pocono Mountain Observatory

The Pocono Mountain Observatory is a privately owned facility             
           located in the heart of the Pocono Mountains PA.

Chandra X-Ray Observatory deployed, 1999.

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Monday July 23, 2018 All Day
Annually on July 23

Chandra X-Ray Observatory deployed, 1999.

http://en.wikipedia.org/wiki/Chandra_X-ray_Observatory