![]() Long bridges, like the Verrazano-Narrows Bridge in New York, has to factor in the changing direction of down due to the curvature of Earth's surface over its four mile span. ![]() Two key principles, equilibrium and symmetry.īuild a bridge and every brick, cable, and bolt has to perfectly balance the tension, pressure, and torque resulting from the downward gravitational pull on all other parts of the bridge. It loves building spheres like stars, planets, and moons, and disks like spiral galaxies, solar systems, and some crazy stuff like quasars.Īll of these things obey the same laws of physics and all of them are held together by gravity. Our universe really seems to be into two shapes in particular. ![]() The reason will get into some of the fundamental realities of our universe. The earth is clearly a sphere and yet the Milky Way is a disk.
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