* Astronomy

Project Blue Book was one of a series of systematic studies of unidentified flying objects (UFOs) conducted by the United States Air Force.
The last publicly acknowledged day of Blue Book operations was December 17, 1969. However, researcher Brad Sparks, citing research from the May, 1970 issue of NICAP's UFO Investigator, reports that the last day of Blue Book activity was actually January 30, 1970. According to Sparks, Air Force officials wanted to keep the Air Force's reaction to the UFO problem from overlapping into a fourth decade, and thus altered the date of Blue Book's closure in official files.
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