This photo, found by UFO investigator Scott Waring, was taken during an unmanned Mercury mission on December 19, 1960. There is a possibility that it’s a reflection on the window, but the shape is unusual enough to suggest something similar to the famous Kumburgaz, Turkey UFO of 2007. Graded B: Possible Unknown.

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http://www.sciencetimes.com/articles/5763/20150419/ufo-spotted-1960-nasa-mercury-mission-photo.htm