March 5: The Museum in Washington, DC will open today. Due to weather, the Udvar-Hazy Center in Chantilly, VA is closed.

Photoelectric Photometer, "Oke Box", Kitt Peak National Observatory,Photoelectric Photometer, "Oke Box", Kitt Peak National Observatory

     

Photoelectric Photometer, "Oke Box", Kitt Peak National Observatory,Photoelectric Photometer, "Oke Box", Kitt Peak National Observatory

 

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