Essentially an astrophysicist called Norman Bergrun analyzed pictures from NASA pictures of Saturn's rings and concluded they were built and aree being built) by aliens in spaceships https://www.goodreads.com/book/show/1470353.Ringmakers_Of_Saturn#
https://br1lib.org/book/5325158/748e23

The guy isn't just a random schizo too, these are his credentials on the amazon page for his short book

>Dr. Norman Bergrun is an alumnus of Ames Research Laboratory, NACA (National Advisory Committee for Aeronautics) predecessor of Ames Research Center, NASA where he worked twelve years as a research scientist. At Ames, he pioneered the setting of design criteria for airplane thermal ice-prevention and the developing of roll stability laws for airplanes, missiles and rockets. He joined Lockheed Missiles and Space Company (now Lockheed Martin) where he was manager of the planning and analysis of flight tests for the Navy Polaris Underwater Launch Missile System. During his thirteen years at Lockheed, he also served as a senior scientist having responsible analysis cognizance of special space-satellite applications. An Associate Fellow of the American Institute of Aeronautics and Astronauics (AIAA), he is active as a leader in Congressional Visits Day events on Capitol Hill. Credited with numerous awards and citations including the California Society of Professional Engineers Archimedes Engineering Achievement Award... he is listed in "Who's Who in America", "Who's Who in Science and Engineering", and other reference works.