text: Space can be finite and not have an edge either. Think of old video games like "asteroids." You can fly in a straight line forever and never come to the edge of the screen. The 2-D space in asteriods "wraps around" back at itself. Our 3-D space could be on the surface of a 4-D hypersphere, or a torus or lots of other shapes. Just like stuck in 2-D on the surface of the earth you can walk (and boat) forever in a straight line and never find an edge, the same can apply to the universe.\n\nThere is no "other side" because you never reach an "end".  Going off the 3-D surface of the hypersphere does not count because you are moving into another dimension, so you are violating the implied premise of the question.