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Vesto Slipher & Carl Wilhelm Wirtz (1910)
measurement of redshift
Vesto Slipher & Carl Wilhelm Wirtz (1910)
observation: most spiral galaxies were moving away from the earth
Georges Lemaître (1927)
proposed alternative idea that the universe is expanding
Red Shift
shifting of color, heat, and the amount of energy
Edwin Hubble (1929)
calculated distances between the earth and several galaxies using redshift of light
Edwin Hubble (1929)
Observation: distant galaxies were moving away from the Earth and one another
Robert Wilsion & Arno Penzias (1965)
discovered CMBR
Cosmic Microwave Background Radiation (CMBR)
a low, steady humming noise believed to be energy remains
Modern Astronomy (2014)
Universe is estimated to be 13.8 billion years old
Modern Astronomy (2014)
5% was left to be discovered/predicted
Modern Astronomy (2014)
5% of its composition existing as ordinary matter