A new study proposes that our location within a vast supervoid, the KBC supervoid, could explain the discrepancy known as the Hubble tension - the difference in measurements of the universe's expansion rate.
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Is the Milky Way's position in a supervoid responsible for the Hubble tension? New research suggests that a troubling disparity in the rate of expansion of the universe, known as the Hubble constant, may arise from the fact Earth sits in a vast underdense region of the cosmos. 'Voids are regions of the universe where the density is below average,' team member and University of Saint Andrews cosmologist Indranil Banik told Space.com. 'Supervoids are voids larger than about 300 million light-years.' The universe is expanding which means that the Hubble constant measures the speed at which distant galaxies recede away from each other. This may initially seem to make a discrepancy in rates of the Hubble constant a less pressing issue. After all, it doesn't affect how far you have to reach for your morning coffee. The problem is without understanding how fast the universe is expanding, cosmologists can't understand how the cosmos evolved, and our best model of this evolution, the Lambda Cold Dark Matter (Lambda CDM) or 'the standard model of cosmology,' is missing something. Breaking space news, the latest updates on rocket launches, skywatching events and more! Receive email from us on behalf of our trusted partners or sponsors A diagram representing the Keenan–Barger–Cowie supervoid amid the cosmic web of matter that spans the universe. The Milky Way is located off-center of the void. 'The KBC supervoid is a region that is about 20% less dense than the cosmic average, centered roughly where we are and extending out to about a billion light years,' Banik said. 'Typically, when people measure the Hubble constant using distances and 'This means that people typically don't look beyond about 2 billion light year
COSMOLOGY HUBBLE CONSTANT SUPERVOID MILKY WAY EXPANDING UNIVERSE
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