我们能否知晓宇宙的形状？

Can we ever know the shape of the universe? From a sheet to a saddle or something else entirely, Leah Crane explores what observations tell us about the size and shape of our universe START off in any direction and fly through the universe. Out of our solar system, beyond the edge of the Milky Way, into the wilderness of the distant cosmos, past black holes, galaxies and near-infinite worlds… or are they infinite? Could you go on forever or would you eventually reach an edge? This is the biggest problem in cosmology, especially if you take the word “biggest” literally: what is the size and shape of our universe? The simplest shape would be a flat sheet. …