On January 1, 1925, astronomer Henry Norris Russell revealed Edwin Hubble's groundbreaking findings that the Milky Way is not the entirety of the universe. Hubble identified variable stars known as Cepheids, proving that the Andromeda 'nebula' is actually a separate galaxy, moving away from us. This discovery led to the realization that there are hundreds of billions of galaxies in the universe, each receding at varying speeds, suggesting an expanding universe. Hubble’s work sparked a revolutionary shift in astronomy that continues to influence our understanding of the cosmos today.
Hubble's discoveries launched a revolutionary rethinking of our cosmos, establishing that the Milky Way is just one of countless galaxies, fundamentally altering our view of the universe.
The findings revealed that the Milky Way did not encompass the cosmos and that myriad galaxies exist beyond, initiating a massive paradigm shift in astronomy.
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