Edwin Hubble-Expanding universe

By bfiorello

  • Doppler shift

    He had started measuring the Doppler shift of spectral lines from spiral nebulae .

  • exhibited redshifts

    By 1925 he had shown that most exhibited redshifts in their spectral lines.

  • Mass of the universe

    In 1927 Edwin Hubble estimation of the mass of the universe cause both Einstein and De Sitter observations incorrect.

  • Cosmological theories

    In 1928 Edwin Hubble attended a meeting of the International Astronomical Union, held that year in Holland. There Hubble discussed cosmological theories with de Sitter.

  • Expanding universe

    In 1929 the theory of the expanding universe was created.