What did Hubble definitively prove about the Andromeda Nebula in 1924?
Answer
It was another massive galaxy outside the Milky Way
By identifying Cepheids within the Andromeda Nebula, Hubble proved it resided far outside the confines of the Milky Way, establishing it as an independent galaxy and expanding the known universe significantly.
Related Questions
What was Edwin Hubble's critical tool for measuring vast distances to spiral nebulae?What did Hubble definitively prove about the Andromeda Nebula in 1924?What phenomenon, observed by Hubble and Humason, indicated that distant galaxies were moving away from us?What relationship, formulated by Hubble in 1929, demonstrated that the universe was not static?Why did Albert Einstein initially introduce the Cosmological Constant ($\Lambda$) into General Relativity?What famous description did Einstein later give to his addition of the Cosmological Constant?Hubble's expansion data helped Einstein by confirming which aspect of General Relativity?Which scientist established the fundamental relationship used by Hubble to determine the true luminosity of Cepheid variable stars?What concept, functionally equivalent to Einstein's $\Lambda$, has been reintroduced in modern cosmology since the late 1990s?Besides mapping galaxy distances, what was Hubble's third crucial contribution regarding Einstein's theory?