Andromeda Novae Distance Argument
Uses the faintness of novae recorded in Andromeda to argue that M31 lies far beyond the Milky Way and is an independent stellar system.
Historical biography archive · Updated 2026-11-03
Heber Doust Curtis Biography and Timeline
Follow Heber Doust Curtis through 2 dated historical records for United States.
Heber Doust Curtis, historical timeline
A chronological timeline drawn from matching World History Database records.
2Distinct records
1 of 1Page
1917–1920Years on this page
1917
1920
Great Debate Andromeda Argument
Uses spiral nebulae including Andromeda in the Great Debate, arguing that they are external galaxies rather than small objects inside the Milky Way.
Records, sources and methodology
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