1923 ⟶ Hubble Discovers Galaxies

Edwin Hubble: Galaxies discovered
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Year
1912
1923
1924

🔭 Leavitt Discovers Period-Luminosity Relation for Cepheids

Henrietta Swan Leavitt discovers the period-luminosity relation for Cepheid variables, where the intrinsic brightness of a star is proportional to its luminosity oscillation period. It opened a whole new branch of possibilities of measuring distances on the universe, and this discovery was the basis for the work done by Edwin Hubble on extragalactic astronomy.⟶
Leavitt Discovers Period-Luminosity Relation for Cepheids (1912)
AstronomyCepheid VariablesLeavittCosmologyDistance MeasurementExtragalactic Astronomy
United StatesUnited States

🔭 Hubble Discovers Galaxies

Edwin Hubble: Galaxies discovered⟶
Hubble Discovers Galaxies (1923)
AstronomyCosmologyGalaxiesHubbleExtragalactic Astronomy20th Century AstronomySpaceUniverse
United StatesUnited States

🌠 Hubble discovers galaxies beyond our own

Edwin Hubble discovers a Cepheid variable star in the "Andromeda Nebula" and proves that Andromeda and other nebulas are galaxies far beyond our own. By 1925, he produces a classification system for galaxies.⟶
Hubble discovers galaxies beyond our own (1923)
HubbleGalaxiesCosmologyAndromedaAstronomy20th Century AstronomyExpanding Universe
United StatesUnited States

🌌 Hubble Discovers the Milky Way is One of Many Galaxies

Edwin Hubble: the discovery that the Milky Way is just one of many galaxies⟶
Hubble Discovers the Milky Way is One of Many Galaxies (1924)
AstronomyCosmologyGalaxiesMilky WayHubbleExtragalactic Astronomy20th Century AstronomyUniverse
United StatesUnited States