Veil

The Veil is a type of planetary shield that operates using hyperspace. In most of its uses, Veils protect inhabitants of a planet from the rest of the galaxy, be it from galactic warfare or awareness of alien neighbors. The Veil essentially puts a planet somewhere else in space, using what amounts to two inverse wormholes, one leading from outside the planet to somewhere else in space, and one leading from the planet to somewhere else in space. From inside the Veil, you can only see what its creators want you to see, and from outside, you can see planet normally. The Veil is extremely flexible; normally it forms a sphere around the planet, but when something would move through it, it simply stretches and moves to maintain the original position of the object relative to itself. Objects on different sides of the Veil cannot physically interact; a spaceship from outside Veil could fly through buildings inside the Veil. The Veil is projected from a number of beacons outside of the Veil, although some rest on the surface of the planet; if all beacons are destroyed, the Veil shatters. Also, the Veil can only withstand a certain number of objects (or a total volume) passing “inside” it before it shatters; and this amount is inversely proportional to number of beacons, so if all but one beacon inside the Veil are destroyed, the Veil could be easily shattered by a large volume passing inside it.