“Great Known Unknown” –The Number of Galaxies Beyond the Observable Universe

    According to current measurements, the size of the cosmos must be larger than a hundred billion light-years. This is the order of magnitude of the universe we have indirect access to, writes physicist Carlo Rovelli. “It is around 1060 times greater than the Planck length, a number of times that is given by … Continue reading “Great Known Unknown” –The Number of Galaxies Beyond the Observable Universe