>"the characteristic length scale of strings is assumed to be on the order of the Planck length, or 10−35 meters, the scale at which the effects of quantum gravity are believed to become significant."
Does it matter for the theory that it has to be exactly at (the currently defined) Planck length, and that if it's anything else the theory breaks down? What about simply "that order of magnitude"?
Does it matter for the theory that it has to be exactly at (the currently defined) Planck length, and that if it's anything else the theory breaks down? What about simply "that order of magnitude"?