Planet UMMO

History

The UMMO claim began in January 1965 in Madrid when researchers in a small esoteric study group called Saucerists started receiving typewritten letters signed with a circular symbol resembling a stylised "H" or curved-bar emblem. The letters claimed to come from inhabitants of UMMO, a planet orbiting the star Wolf 424, fourteen light-years from Earth. Over the following decades, several thousand letters arrived at addresses across Spain, France, Belgium, Argentina and the United States, totalling something on the order of six thousand pages of typewritten material in Spanish, French and occasional English translation.

The letters were not delivered all at once. They arrived in batches over thirty years, addressed to UFO researchers, to academics in physics and mathematics, to journalists, and sometimes to ordinary subscribers. Their content covered claimed UMMO history, social organisation, scientific descriptions of planetary conditions on UMMO, instructions for terrestrial scientific work, and detailed cosmological speculation. The technical material drew enough on then-contemporary physics that early recipients including the physicist Jean-Pierre Petit took the claim seriously enough to publish responses.

The claim was eventually attributed by various investigators to José Luis Jordán Peña, a Spanish researcher who confessed in 1993 to having originated the UMMO material as a sociological experiment. The confession is itself disputed, with some commentators arguing the volume and consistency of the material across thirty years exceeds what a single individual could have produced. The corpus of UMMO letters remains the most extensively documented case of sustained anonymous correspondence claiming extraterrestrial origin in the modern UFO literature.