Estimates set the lower bound at 250x the size of the observable universe, according to the limits of measurement of the "flatness" of our local space. https://

Estimates set the lower bound at 250x the size of the observable universe, according to the limits of measurement of the "flatness" of our local space. https://arxiv.org/abs/1101.5476 https://arxiv.org/abs/1101.5476