Cyora Monolith

A type of large precursor structure constructed on the various large moons of Cyora. 
There is always exactly 1 monolith on each of these planets and they are all almost exactly the same. They only differ in the teleportation console allowing teleportation between the various planets of the Cyora system. It is theorised that the one on Zanrilles might be different as that has probably engineered all life there, but as of current there is no known difference.
The various Cyora monoliths are all exactly 271 m in height and span a large roughly circle area averaging 480 m in radius. These are large enough to have a small impact on the orbits of the planets they are built on. The central interplanetary teleporter was constructed for easy access. There are 5 different roads that lead to the centre of the structure where the teleporter is located. As it is large and open, anyone using the device is exposed to the elements which, on most of the Cyora planets, is fatal. Nr, for example, is extremely hot. Therefore it wouldn't see much use until the Phelke civilization invented suits that can withstand these adverse conditions.