US EditionIs 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.
The 'sound of the Big Bang' hints that Earth may sit in a cosmic void 2 billion light-years wide
The "Hubble tension," one of the most frustrating and lingering problems in science, could be solved if Earth and the Milky Way sit in a 2 billion light-year wide low-density void.
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