>You see, class. When Einstein developed the theory of relativity, it transformed theoretical physics and astronomy during the 20th century, superseding a 200-year-old theory of mechanics created primarily by Isaac Newton. It introduced concepts such as spacetime, a unified entity of space and time, which fuses the three dimensions of space and the one dimension of time into a single four-dimensional mani... ANON, GET YOUR HAND OUT OF YOUR PANTS... anyway, manifold. Spacetime diagrams can be used to visualize relativistic effects, such as...
