UX-7 is a rare binary star system home to an primitive alien race that has not yet been discovered. The aliens live on the first planet. It is part of the UX Series Star Systems.

In YE 35 the Scientific Studies Service (SSS) deployed a Ke-P6-02a Bisen Lighthouse in orbit above planet UX-7 I at the request of the Star Army of Yamatai to allow observation of the lifeforms below.

• K2 V Orange Main Sequence
• Radius 6.75 x 10⁵ km (0.97 x sol)
• Mass 1.99 x 10³⁰ kg (1.00 x sol)
• Temperature 4600 K
• Luminosity 1.59 x 10²⁶ W (0.42 x sol)

• K4 IV Orange Subgiant
• Distance 1.27 x 10⁸ km (0.85 AU)
• Radius 1.71 x 10⁶ km (2.46 x sol)
• Mass 1.88 x 10³⁰ kg (0.95 x sol)
• Temperature 4300 K
• Luminosity 4.23 x 10²⁷ W (11.06 x sol)

• Terrestrial World
• Orbital Radius 4.19 x 10⁸ km (2.80 AU)
• Period 2.93 x 10⁴ hours (3.36 earth years)
• Physics Standard iron/silicate
• Gravity 9.64 m/s² (0.99 x earth)
• Hydrosphere 8 % water, 4 % ice
• Atmosphere Standard toxic
• Biosphere Microbes, fungi, sentient humanoids
• Civilization Alien Homeworld

• Rock Planet
• Orbital Radius 7.16 x 10⁸ km (4.79 AU)
• Period 6.56 x 10⁴ hours (7.51 earth years)
• Gravity 12.94 m/s² (1.32 x earth)

• Rock Planet
• Orbital Radius 1.51 x 10⁹ km (10.08 AU)
• Period 2.00 x 10⁵ hours (22.93 earth years)
• Gravity 11.00 m/s² (1.12 x earth)
• Special Trace atmosphere

• Ice Planet
• Orbital Radius 2.68 x 10⁹ km (17.91 AU)
• Period 4.75 x 10⁵ hours (54.29 earth years)
• Gravity 18.26 m/s² (1.87 x earth)
• Special Wreckage of a crashed starship

• Ice Planet
• Orbital Radius 5.51 x 10⁹ km (36.86 AU)
• Period 1.40 x 10⁶ hours (160.37 earth years)
• Gravity 6.10 m/s² (0.62 x earth)

• Ice Planet
• Orbital Radius 1.08 x 10^10 km (71.98 AU)
• Period 3.83 x 10⁶ hours (437.55 earth years)
• Gravity 2.59 m/s² (0.27 x earth)
• Special 3 small moons

• Ice Planet
• Orbital Radius 2.15 x 10^10 km (143.46 AU)
• Period 1.08 x 10⁷ hours (1231.19 earth years)
• Gravity 11.64 m/s² (1.19 x earth)
• Heavy volcanism