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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 .
1923 – Edwin Hubble: Galaxies discovered; 1923 – Arthur Compton: Particle nature of photons confirmed by observation of photon momentum; 1924 – Bose–Einstein statistics; 1924 – Louis de Broglie: De Broglie wave; 1925 – Werner Heisenberg: Matrix mechanics; 1925–27 – Niels Bohr & Max Planck: Quantum mechanics
As one of the first steps towards a coherent theory of galaxy evolution, the American astronomer Edwin Hubble, developed a classification scheme of galaxies in 1926. Although this scheme, also known as the Hubble tuning fork diagram, is now considered somewhat too simple, the basic ideas still hold...
Tuning-fork-style diagram of the Hubble sequence Galaxy morphological classification is a system used by astronomers to divide galaxies into groups based on their visual appearance. There are several schemes in use by which galaxies can be classified according to their morphologies, the most famous being the Hubble sequence , devised by Edwin ...
Hubble's law is considered the first observational basis for the expansion of the universe, and is one of the pieces of evidence most often cited in support of the Big Bang model. [8] [17] The motion of astronomical objects due solely to this expansion is known as the Hubble flow. [18]
In 1924, American astronomer Edwin Hubble's measurement of the great distance to the nearest spiral nebulae showed that these systems were indeed other galaxies. Starting that same year, Hubble painstakingly developed a series of distance indicators, the forerunner of the cosmic distance ladder , using the 100-inch (2.5 m) Hooker telescope at ...
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.
1995 – Hubble Deep Field image taken. [226] It is a landmark in the study of cosmology. 1998 – The first complete Einstein ring, B1938+666, discovered using the Hubble Space Telescope and MERLIN. [227] [228] 1998-99 – Scientists discover that the expansion of the Universe is accelerating. [229] [230]