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- The space within a star system is called the interstellar medium.
- Most sophonts require the use of a vacc suit to survive within a vacuum.
- It is also known as a Type 0 Atmosphere or Hard Vacuum.
Worlds of Size 1 or less are asteroids, orbital complexes, space stations, and other small satellites, and are much too small to retain a breathable atmosphere. They are uninhabitable by most forms of life without technological support. 
- Although a trace atmosphere denotes a thin veneer of gasses around a world (such as Mercury), it is of such barely measurable pressures that it may as well be a vacuum. Animal and plant life is non-existent on an airless world, although exotic and incredibly rare examples of vacuum life might exist (...and certainly be worthy of an IISS Scout mission).
- Mainstream sophonts must resort to living in bubble cities, underground settlements and other artificial, sealed environments. It can be difficult for a scout to differentiate these vacuum habitats. Try to take note of distinctive features at these settlements such as interesting geographical locations: at the entrance to a huge mine, straddling a small meteorite crater, along the walls of a canyon, inside old lava tubes, in the caldera of an extinct volcano, inside a network of vast, natural caves ... and so on.