What is outside the universe?

you can have whatever you want. You Mao Ge don't seem to be joking with you. There is no space and time outside the universe, and there is no matter in our universe, because time and space are two attributes of our universe. Space is the form of matter existence, and time is the form of object movement. The movement of zero-dimensional points produces one-dimensional lines, and the movement of one-dimensional lines produces two-dimensional surfaces. The movement of two-dimensional surfaces produces three-dimensional solids, and the movement of three-dimensional solids produces four-dimensional time. If the objects in our universe do not move, there will be no time. But I think your question has another meaning: "What is outside our universe?" According to quantum mechanics, there may be parallel universes outside our universe, and the forms of matter in other universes may be the same as or different from ours. Every physical law that restricts other universes may be different. What you want to exist may exist in other universes, but it has nothing to do with our universe, because parallel universes are named because they are "parallel", that is, "disjoint" and independent of each other. The above master mentioned the membrane, so let me also say that membrane, as the product of the first string theory revolution, is bound to string higher-dimensional theoretical things, involving advanced physics, which is usually taught after doctoral graduation, so I won't introduce it here, but membrane chords were originally used to study the theory of dark matter, not to say that membranes with five dimensions or above are other universes, and membranes with five dimensions or above may belong to our universe, but there are also other universes, just like