Citation | Has made outstanding contributions to radio astronomy in instrumentation, observation and interpretation. He was the first to show that discrete radio sources (1) are of greater than stellar dimensions, and (2) consist of two distinct classes, galactic and extra-galactic. He developed a novel form of radio-telescope, now popularly known as the Mills Cross, which made possible the first reliable high-resolution surveys over a substantial portion of the sky. Results obtained by him with this instrument have been of outstanding importance in the development of radio astronomy. |