1888

Heinrich Hertz makes and detects radio waves.

1932

Karl Jansky discovers the first extra terrestrial radio source.

1941

Grote Reber Maps the sky in a radio frequency.

1942

J. S. Hey discovers radio emissions from the Sun and uses them to work out the temperature of the chromosphere and photosphere.

1946

J.S. Hey uses radio reflections to estimate the velocities of meteors.

1948

J. H. Piddinton and H.C. Minnett  examine 1.25cm waver to take the temperature of the Moon and discover that the surface is covered in a layer of dust.

1944

H. C. van de Hulst calculated that 21.3cm wavelength radio waves should be produced by hydrogen atoms in space.

Cygnus A is identified as the first 'radio galaxy'.

1950

B. F. Burke discovers radio emissions from Jupiter and identifies them as caused by interactions with its moon Io.

1951

Ewen and Purcell at Harvard discover Hydrogen clouds in interstellar space  by
 the detection of the 21.3cm radio waves they emit.   This enables the mapping of objects like supernovae remnants.

1960

T.A. Matthews discovers the radio source 3C48.

M. Schmidt works out the distance of 3C48 as 3 billion light years.   Other radio work goes to show that these are galaxy sized objects emitting tremendous amounts of energy.   They are termed quasi-stellar-radio-sources or quasars for short.

1963

Arno Penzias and Robert Wilson discover the microwave background emission from the Big Bang.

1967

Jocelyn Bell discovers pulsar emissions.

TO BE CONTINUED