Wolf-Rayet stars (often referred to as WR stars) are a heterogeneous set of stars with unusual spectra showing prominent broad emission lines of highly ionised helium and nitrogen or carbon. The Solar System is located inside the "Local Bubble", which is a cavity in the interstellar medium (ISM) in the Orion Arm of the Milky Way. It contains, among others, the Local Interstellar Cloud and the G-cloud. An iron planet is a type of planet that consists primarily of an iron-rich core with little or no mantle. In science fiction – such a planet is also known as a Cannonball. The space telescope is a very advanced Telescope to scan extrasolar Star Systems directly from the Solar System. It is stationed at the Lagrange Point L2 and consists of several reflector mirrors, each at a distance of several million kilometers to the other.