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04/05/1933 Galactic radio waves are discovered

37:42

Understanding Radio Telescopes: Dr John Morgan

12:01

Telescopes: Crash Course Astronomy #6

18:28

Hidden Visions (Radio Astronomy imaging techniques)

American physicist Karl Jansky described radio waves coming from the Milky Way in a paper he read to the International Radio Union in Washington. The galactic radio waves were of very low intensity and wavelength (14.6 m, frequency about 20 MHz) and required a sensitive apparatus for their detection.
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