The Mighty Shall Be Weak
A. Zee · 2001
Abstract When my son Andrew was about four years old, he asked me whether gravity or Superman were stronger. Clearly, I replied, Superman’s got to be stronger, since he can zip away from the earth’s gravity at a moment’s notice. But on second thought, is Superman strong enough to move galaxies around? Can Superman rein in the expansion of the whole universe? Only gravity is strong enough to get the universe to perform.