1912 ⟶ Cepheid Variable Period-Luminosity Relation
Henrietta Swan Leavitt: Cepheid variable period-luminosity r...
Year
1910
1912
1923
🌟 Fleming Publishes Discovery of White Dwarf Stars
Williamina Fleming publishes her discovery of white dwarf stars.⟶
AstronomyStellar AstronomyWhite DwarfFlemingAstrophysics
United States🌟 Cepheid Variable Period-Luminosity Relation
Cepheid VariablesPeriod-Luminosity RelationAstronomyDistance MeasurementHenrietta Swan LeavittCosmologyStellar Astronomy
United States🔭 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.⟶
AstronomyCepheid VariablesLeavittCosmologyDistance MeasurementExtragalactic Astronomy
United 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.⟶
HubbleGalaxiesCosmologyAndromedaAstronomy20th Century AstronomyExpanding Universe
United States