 The U.S. military claimed no knowledge of any military missiles or commercial satellite launches, fueling a mystery that made international news.Theories ranged from alien spacecraft to Chinese missiles to top-secret U.S. military experiments.Many experts appeared in the news media suggested that the UFO was probably a missile of some sort, including retired United States Air Force Lieutenant General Thomas G. McInerney and Michio Kaku, a physics professor at City University of New York (who later reversed his opinion).