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His writings claim that advanced civilizations exist or once existed on the Moon, Mars and on some of the moons of Jupiter and Saturn, and that NASA and the United States government have conspired to keep these facts secret. He has advocated his ideas in two published books, several videotapes, lectures, interviews, and press conferences. His views have never been published in peer-reviewed journals. Hoagland has been described by James Oberg of The Space Review and Phil Plait of Bad Astronomy as a conspiracy theorist and fringe thinker.


Hoagland says that he served as a curator of astronomy & space science at the Springfield Science Museum, located at The Quadrangle in Springfield, Massachusetts, and that he was a consultant to CBS News during the Apollo program. Hoagland appears regularly as a Science Adviser on Coast to Coast AM with George Noory. Hoagland has also appeared on the BBC programs UFO Evidence & Conspiracy, and Mysteries in Space. Hoagland co-produced a radio program on WTIC (AM) of Hartford, Connecticut, The Night of the Encounter, which covered the July 14, 1965, Mariner 4 flyby of the planet Mars.[note 1] Hoagland authored the book The Monuments of Mars: A City on the Edge of Forever, and co-authored the book Dark Mission: The Secret History of NASA, which was ranked 21st on the New York Times Best Seller list for Paperback Nonfiction for one week on November 18, 2007.