Are wormholes and black holes 3d or 4d objects?

The simple exercise is to realize that points in a 4-dimensional spacetime are specified by 4 coordinates, then ask if it takes 4 coordinates to identify points inside a wormhole or black hole. read more

It is a straightforward exercise to see that black holes and wormholes occupy all 4 spacetime dimensions. The simple exercise is to realize that points in a 4-dimensional spacetime are specified by 4 coordinates, then ask if it takes 4 coordinates to identify points inside a wormhole or black hole. read more

Pierce the paper (in below pic) with a pencil. You will get a 2d shape when you see it but its actually a 3d structure (something like wormhole if you consider a black hole to be a wormhole). read more

Like black holes, wormholes arise as valid solutions to the equations of Albert Einstein's General Theory of Relativity, and, like black holes, the phrase was coined (in 1957) by the American physicist John Wheeler. read more