Question: The Center for UFO Studies was a group founded by an American astronomer who acted as scientific advisor to UFO studies undertaken by who?
Sentence (from "J. Allen Hynek"): Hynek acted as scientific advisor to UFO studies undertaken by the U.S. Air Force under three consecutive projects: Project Sign (1947–1949), Project Grudge (1949–1952), and Project Blue Book (1952–1969).
Relevant evidence: Yes