What scientific realization, stemming from Edwin Hubble's work, underscored the immense scale of the universe relative to our planet?
Answer
The Andromeda nebula was an entire galaxy outside the Milky Way
Edwin Hubble’s 1923 discovery demonstrated that what was previously thought to be a nebula was, in fact, an entirely separate galaxy situated far outside the Milky Way, instantly expanding the perceived scale of the cosmos.
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