As a physicist specializing in theoretical physics, I can tell you that the concept of a "portal" as commonly understood — a gateway to another place or dimension — is a staple of science fiction and has no basis in established science as of my last update in early 2023. However, I can discuss the idea from a theoretical perspective.

In theoretical physics, there are concepts that are somewhat analogous to portals, such as wormholes, which are solutions to the equations of general relativity. A wormhole is a hypothetical topological feature of spacetime that would fundamentally be a shortcut connecting two distinct points in space and time. However, the existence of wormholes is purely speculative, and if they do exist, they would likely be unstable and require a form of exotic matter with negative energy density to keep them open, which has never been observed.

Another concept is the Alcubierre drive, which is a theoretical method of traversing faster-than-light (FTL) distances by "warping" the space around a spacecraft, creating a "bubble" of flat spacetime that moves through the curved spacetime. This is also purely theoretical and would require a form of matter with negative mass, which is also speculative.

It's important to note that both of these concepts are highly speculative and face significant theoretical and practical challenges. They are not a means to "make a portal" in the way that one might imagine from science fiction.

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In Minecraft, you need 14 obsidian and 1 flint and steel to make a nether portal. You will use obsidian to build the frame of the nether portal. The base of the nether portal should be 4 obsidian wide, and the sides of the nether portal should be 5 obsidian high. This design will use 14 blocks of obsidian.read more >>