Martin Ryle died in Cambridge. He won the Nobel Prize in Physics in 1974. Born in Brighton in 1918, he is counted among the founders of radio astronomy. He conceived the "aperture synthesis" antennas, which, by using interferometers, can provide the powerful resolution of a large antenna by employing a certain number of smaller antennas in an appropriate geometric arrangement. Thanks to interferometry, from the 1970's on radio astronomy has been able to provide a more complete and profound view of the universe and of its more energized bodies, and therefore, completing the data of a cosmology based purely on optical measurements. By 1955, before the discovery of centimetric radiation in the thermal background, Ryle's studies of the calculations of radio waves led him to reject the cosmological model of the stationary state, a model that would be definitively abandoned in succeeding decades.