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Outerspace (Environment (Wormholes, Gravity, Planets, Stars), Habitation…
Outerspace
Environment
Wormholes
Gravity
Planets
Stars
Habitation
Space stations
Spaceships
Colonies
Aliens
UFOs
Tractor beam
Lazer
Hazards
Asteroids
Shoot until destroyed
Fragment when destroyed
Valuable asteroids
Black holes