Edwin Hubble announces his discovery that Andromeda, previously believed to be a nebula, is actually another galaxy, and that the Milky Way is only one of many such galaxies in the universe. (23 nov 1924 anni – 5 sett 1925 anni)
Aggiunto al nastro di tempo:
Data:
23 nov 1924 anni
5 sett 1925 anni
~ 9 months