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Edwin Powell Hubble (November 20, 1889 – September 28, 1953) [1] was an American astronomer. He played a crucial role in establishing the fields of extragalactic astronomy and observational cosmology .
Edwin Hubble discovered that the universe is expanding and that the farther away a galaxy is, the faster it is moving away from us. Two years later, Georges Lemaître suggests that the expansion can be traced to an initial "Big Bang".
The following is a list of people who are not astronomers but made a contribution to the field of astronomy and astrophysics. Hans Bethe (1906–2005), (physicist) Niels Bohr (1885–1962), (physicist) Andreas Cellarius (Netherlands, Germany, 1596–1665), (cartographer) Freeman Dyson (1923–2020), (physicist) Albert Einstein (1879–1955 ...
1849 – Santiago observatory set up by USA, later becomes Chilean National Observatory (now part of the University of Chile) [16] 1859 – Kirchhoff and Bunsen develop spectroscopy; 1864 – Herschel's so-called GC (General Catalogue) of nebulae and star clusters published; 1868 – Janssen and Lockyer discover Helium observing spectra of the Sun
November 23 – Edwin Hubble announces his discovery that Andromeda, previously believed to be a nebula, is actually another galaxy, and that the Milky Way is only one of many such galaxies in the universe. [1] The Einstein Tower near Potsdam, Germany, designed by Erich Mendelsohn, becomes operational as an astrophysical observatory.
Two years later, Hubble showed that the relation between the distances and velocities was a positive correlation and had a slope of about 500 km/s/Mpc. [10] This correlation would come to be known as Hubble's law and would serve as the observational foundation for the expanding universe theories on which cosmology is still based.
1924: Wolfgang Pauli: quantum Pauli exclusion principle; 1924: Edwin Hubble: the discovery that the Milky Way is just one of many galaxies; 1925: Erwin Schrödinger: Schrödinger equation (Quantum mechanics) 1925: Cecilia Payne-Gaposchkin: Discovery of the composition of the Sun and that hydrogen is the most abundant element in the Universe
It was used by Edwin Hubble to make observations with which he produced two fundamental results which changed the scientific view of the Universe. Using observations he made in 1922–1923, Hubble was able to prove that the Universe extends beyond the Milky Way galaxy, and that several nebulae were millions of light-years away.