radio astronomy

Project Diana hits the Moon

Project Diana hits the Moon

On January 10, 1946 the U.S. Army Project Diana team detected radar signals reflected off the moon‘s surface. This was the first experiment in radar astronomy and the first active attempt to probe another celestial body. Project Pioneer John H. DeWitt Project Diana was designed in order to bounce radar signals off the Moon and receive the reflected signals, which became the first known attempt to probe another celestial body. Pioneer of…
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Karl Jansky and the Discovery of Cosmic Radio Waves

Karl Jansky and the Discovery of Cosmic Radio Waves

On October 22, 1905, American physicist and radio engineer Karl Guthe Jansky was born. In August 1931 Jansky first discovered radio waves emanating from the Milky Way. He is considered one of the founding figures of radio astronomy. Karl Jansky was born the third of six children in what was then the Territory of Oklahoma where his father, Cyril M. Jansky, the descendent of Czech immigrants, was Dean of the College of Engineering…
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Sir Martin Ryle and Radio Astronomy

Sir Martin Ryle and Radio Astronomy

On September 27, 1918, English radio astronomer and Nobel Laureate Sir Martin Ryle was born. Ryle developed revolutionary radio telescope systems and used them for accurate location and imaging of weak radio sources. He was Astronomer Royal from 1972 to 1982 and shared the Nobel Prize in Physics in 1974 with Antony Hewish, the first Nobel prize awarded in recognition of astronomical research. Martin Ryle was the son of Professor John Alfred Ryle and Miriam…
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Alan Sandage and the Discovery of the Quasars

Alan Sandage and the Discovery of the Quasars

On June 18, 1926, American astronomer Allan Rex Sandage was born. Sandage determined the first reasonably accurate values for the Hubble constant and the age of the universe. Foremost, he is also credited with the discovery of the 3C 48 quasar, i.e. quasi-stellar radio sources which are the most energetic and distant members of a class of objects called active galactic nuclei. The Discovery of Quasars It is believed that the first…
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Grote Reber and Radio Astronomy

Grote Reber and Radio Astronomy

On December 22, 1911, American pioneer of radio astronomy Grote Reber was born. He combined his interests in amateur radio and amateur astronomy and became instrumental in investigating and extending Karl Jansky’s pioneering work, who in August 1931 first discovered radio waves emanating from the Milky Way. Reber conducted the first sky survey in the radio frequencies and is considered one of the founding figures of radio astronomy. Grote Reber graduated from Armour Institute of…
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Jan Hendrik Oort and the Secrets of the Oort Cloud

Jan Hendrik Oort and the Secrets of the Oort Cloud

On April 28, 1900, Dutch physicist and astronomer Jan Hendrik Oort was born. One of the greatest astronomers of the 20th century, Oort made significant contributions to the understanding of the Milky Way and who was a pioneer in the field of radio astronomy. Oort determined that the Milky Way rotates and overturned the idea that the sun is at its center; he discovered mysterious invisible ‘dark matter‘ in 1932, as well…
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