> What shape is the Universe? Or, to put it another way, If you get into a starship, set off in one direction, and keep going, will you eventually return to your starting point, as you would if you set off around the Earth? The jury is still out, apparently, pending further and better information about the curvature of space. “It's a fascinating question to explore. Even though all signs seem to point towards ‘probably not’, there are actually two ways that the answer might turn out to be yes, after all”