RAND's James Lipp letter on the spaceship hypothesis

When
RAND Corporation headquarters on Main Street, Santa Monica
The RAND Corporation in Santa Monica, where James Lipp wrote his 1948 letter Cbl62, CC BY-SA 3.0, via Wikimedia Commons

RAND scientist James Lipp answered Brig. Gen. Donald Putt's request with a letter weighing whether flying objects could be spaceships. He judged such visits possible but very improbable, and the letter was printed as Appendix D of the February 1949 Project Sign report.

Sources

  1. OfficialProject SIGN report (February 1949), Appendix D: letter to Brig. Gen. Putt, 13 December 1948 (opens in a new tab)U.S. Air Force, Air Materiel Command (copy hosted by the Internet Archive) / 1949-02

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