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Is Earth inside a huge void? 'Sound of the Big Bang' hints at possible solution to Hubble tension

EARTH AND THE LOCAL UNIVERSE, JUL 8 – New research shows Earth and the Milky Way lie in a billion-light-year void 20% less dense than average, potentially resolving the long-standing Hubble tension in cosmic expansion rates.

  • Researchers presented new data at the 2025 National Astronomy Meeting at Durham University showing Earth and the Milky Way lie near the center of a large, local void.
  • This theory arose to address the Hubble tension, where nearby measurements of universe expansion show a faster rate than seen from early universe data.
  • Dr. Indranil Banik explained that baryon acoustic oscillations, the "sound of the Big Bang," support the void model, which predicts a faster local expansion due to matter moving toward denser regions outside the void.
  • Banik reported that, based on two decades of BAO data combined with Planck satellite measurements, a cosmological model incorporating a local void is vastly more probable—by a factor of about one hundred million—compared to the standard homogeneous cosmology.
  • If true, this local void could resolve the expansion discrepancy, showing the Hubble tension is mainly a local effect without contradicting the standard cosmological model at larger scales.
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The Earth and our entire galaxy, the Milky Way, could be inside a mysterious giant hole that makes the cosmos expand faster here than in the neighboring regions of the universe, according to astronomers at the University of Portsmouth, United Kingdom.

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Phys.org broke the news in United Kingdom on Monday, July 7, 2025.
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