宇宙空間 (Outer Space / Starry Sky)
参考：
Starry Sky | Unity Asset Store [Official]
SpaceGen – Seamless Space Backdrop Generator | Unity Asset Store [Official]
星雲 (Nebula)
参考：
Skybox Volume 2 (Nebula) | Unity Asset Store [Official]
地球 (Earth)
参考：
Stylized Earth | Unity Asset Store [Official]
Planet Earth Free | Unity Asset Store [Official]
Free Earth Planet – The Best Planet Shader in the Asset Store | Unity Asset Store [Official]
Earth Low Poly | Unity Asset Store [Official]
Planet Earth Pro | Unity Asset Store [Official]
Low Poly Earth | Unity Asset Store [Official]
Planet Earth | Unity Asset Store [Official]
Earth 32k HD | Unity Asset Store [Official]
Realistic Planet Earth | Unity Asset Store [Official]
High Resolution Earth | Unity Asset Store [Official]
Planets Earth, Mars and the Moon | Unity Asset Store [Official]
Planet Earth Layers | Unity Asset Store [Official]
Earth HD 64K | Unity Asset Store [Official]
Earth Rendering | Unity Asset Store [Official]
Earth PBR | Unity Asset Store [Official]
惑星 (Planets)
参考：
Planets Pack | Unity Asset Store [Official]
月／月面 (Moon)
参考：
Moon | Unity Asset Store [Official]
Moon Landscape | Unity Asset Store [Official]
恒星 (Sun)
参考：
Sun | Unity Asset Store [Official]
Realistic Star | Unity Asset Store [Official]
太陽系 (Solar System)
参考：
Low Poly Solar System | Unity Asset Store [Official]
Space Graphics Planets
参考：
Space Graphics Planets | Unity Asset Store [Official]
SPACE for Unity
参考：
SPACE for Unity – Space Scene Construction Kit | Unity Asset Store [Official]
SPACE for Unity 1.5 Warp Effect – YouTube
Space Journey
参考：
Space Journey | Unity Asset Store [Official]
Space Journey 2.0 Free Update – YouTube
Space Combat Kit
参考：
Space Combat Kit | Unity Asset Store [Official]
Universal Vehicle Combat Documentation | VSXGames
Space Combat Kit | Unity Forum
Space Combat Kit Tutorials – Vimeo
Space Sim Framework
参考：
Space Sim Framework | Unity Asset Store [Official]
Space Sim Framework Phase II – YouTube
Space Graphics Toolkit
参考：