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Physics explains that there is a small amount of energy even
               in a completely empty vacuum. This principle gives us a third
               option for the end of universe. The theory is that another kind
               of vacuum may exist, one in which less energy is present. If
               that’s the case, then the universe will last until the “pocket” of
               a lower-energy vacuum appears. Luckily, we’re not aware that
               any such pockets exist. Not so luckily, physics also states that
               such a pocket will inevitably form somewhere in the universe
               if a lower-energy vacuum is possible. If that happens, the new
               vacuum will “modify” the old vacuum surrounding it. T
               he pocket would spread out at nearly the speed of light, so
               we wouldn’t even know what hit us. Humans, planets and
               even the stars would be wiped out. This is
               called the Big Change scenario.                    weirder (adj.):
                                                                  más raro
               The fourth possibility is explained by something termed dark
               energy. Dark energy has a strange property. As the universe
               grows, its density remains constant. So then more of it is
               created over time, to keep up with the expanding volume of
               the universe. Sounds weird? It could get even weirder.






























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