| Webster's Online Dictionary |
| Expressions | Definition | ||
| Horn Antenna | The Horn Antenna, at Bell Telephone Laboratories in Holmdel, New Jersey, is significant because of its association with the research work of two radio astronomers, Arno Penzias and Robert Wilson. In 1965 while using the Horn Antenna, Penzias and Wilson stumbled on the microwave background radiation that permeates the universe. Cosmologists quickly realized that Penzias and Wilson had made the most important discovery in modern astronomy since Edwin Hubble demonstrated in the 1920s that the universe was expanding. This discovery provided the evidence that confirmed George Gamow's and Abbe Georges Lemaitre's Big Bang theory of the creation of the universe and forever changed the science of cosmology--the study of the history of the universe--from a field for unlimited theoretical speculation into a subject disciplined by direct observation. In 1978 Penzias and Wilson received the Nobel Prize for Physics for their momentous discovery. (references) | ||
Source: compiled by the editor from various references; see credits. | Top | ||
| Expressions | Domain | Definition | |
| Horn antenna | Aerospace | = horn. (references) | |
| Horn antenna | Electrical Engineering | An elementary aerial consisting of a waveguide in which one or more transverse dimensions increase towards the open end; a microwave antenna produced by flaring out the end of a circular or rectangular waveguide into the shape of a horn, for radiating radio waves directly into space. Source: European Union. (references) | |
Source: compiled by the editor from various references; see credits. | Top | ||
