Andromeda V1 Plate
Photographs M31 with the 100-inch Hooker telescope and records the star later recognized as Cepheid variable V1 on the famous VAR photographic plate.
Historical biography archive · Updated 2026-11-03
Edwin Hubble Biography and Timeline
Follow Edwin Hubble through 3 dated historical records for United States of America.
Edwin Hubble, historical timeline
A chronological timeline drawn from matching World History Database records.
3Distinct records
1 of 1Page
1923–1925Years on this page
1923
1924
Cepheid Variables Confirmed in Andromeda
Identifies multiple Cepheid variables in M31 and uses their periods to demonstrate that Andromeda is far outside the Milky Way.
1925
Andromeda Extragalactic Result Presented
Presents the Andromeda Cepheid evidence to the astronomical community, establishing M31 as a separate galaxy and greatly enlarging the known scale of the universe.
Records, sources and methodology
These dates and descriptions come from the historical_events database. Exact duplicate records have been collapsed. Names are grouped by the country, Name 2 and Name 1 fields; records with missing Name 2 cannot be reliably assigned to an individual biography. Check the underlying sources before formal citation.