Astronomers who examined the sound waves from the Big Bang say that the Earth and the entire Milky Way could be trapped in a huge void billions of light years across.  Their research, presented at the Royal Astronomical Society's recent National Astronomy Meeting, could solve one of cosmology's greatest mysteries: Hubble tension, or why the older universe appears to be expanding slower than younger regions. "The Hubble tension is largely a local phenomenon, with little evidence that the expansion rate disagrees with expectations in the standard cosmology further back in time," Indranil Banik, a cosmologist from the University of Portsmouth […]