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.

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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.

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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.

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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.

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