Astronomy from1920-1940

By SydneyAlys

  • Galaxies Exist

    Edwin Hubble shows that galaxies exist outside the Milky Way galaxy. exact date is unknown.

  • Liquid Rocket Fuel

    Robert Goddard uses the first liquid rocket fuel.

  • Center of the Milky Way

    The oort cloud shows that the center of the Milky Way galaxy is in Sagittarius.

  • Pluto

    Clyde Tornbaugh discovers Pluto.

  • Cosmic Radio Waves

    Karl Jansky discovers cosmic radio waves.

  • Radio Telescope

    First radio telescope built by Grote Reber. exact date is not known.