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New research suggests our Milky Way galaxy resides within a giant, 2-billion-light-year void, 20% less dense than average. This could explain the Hubble tension, a discrepancy in the universe's expansion rate measured by different methods. Analyzing Big Bang echoes, astronomers found it 100 times more likely we're in a void. This discovery could necessitate revising cosmological models and our understanding of the universe's expansion history.

Prepared by Olivia Bennett and reviewed by editorial team.