Radioastronomy

The radioastronomy is a branch of the Astronomie which deals with the observation of the sky in the field of the waves radio. It is a relatively young Science which made its beginnings in the Années 1930.

Karl Jansky discovered a radio signal with one 23 hours period 56 minutes, that is to say a sidereal Jour, the period characteristic of the passage of the fixed star S, it is the first extraterrestrial radio signal of origin collected on Earth. In 1937, Grote Reber, not having succeeded in being made engage in the team of Jansky, built a Radiotélescope with its own expenses to explore space in the radio operator field, as an amateur. It was practically the only one to make radioastronomy during 10 years. After the Second world war, research started on more large scales with recycled military material (Radar S). The March 25th 1951, Harold Ewen and Edward Purcell detected the line 21 cm of the neutral Hydrogène in the Milky Way with a Antenna horn. In 1963, Arno Allan Penzias and Robert Woodrow Wilson discover the fossil Rayonnement Big Bang envisaged by George Gamow while trying to eliminate a background noise in their equipment from transmission. In 1967, Jocelyn Bell Burnell detected the first Pulsar, and its reader Antony Hewish accepted the Nobel Prize of physics.

In order to obtain sufficient signal, certain antennas are gigantic, for example the Radiotélescope of Arecibo has a diameter of 305 meters. To obtain a fine resolution, one uses networks of antennas and even Broad Very Array.

As for optical astronomy, there exist radioastronomers amateurs.

See too

Internal bonds

External bond

  • the Web site ARAMIS
  • the Web site of the IRAM
  • the Web site of the OBSPM

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