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 10^5 km (0.97 x sol)
• Mass 1.99 x 10^30 kg (1.00 x sol)
• Temperature 4600 K
• Luminosity 1.59 x 10^26 W (0.42 x sol)

• K4 IV Orange Subgiant
• Distance 1.27 x 10^8 km (0.85 AU)
• Radius 1.71 x 10^6 km (2.46 x sol)
• Mass 1.88 x 10^30 kg (0.95 x sol)
• Temperature 4300 K
• Luminosity 4.23 x 10^27 W (11.06 x sol)

• Terrestrial World
• Orbital Radius 4.19 x 10^8 km (2.80 AU)
• Period 2.93 x 10^4 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 10^8 km (4.79 AU)
• Period 6.56 x 10^4 hours (7.51 earth years)
• Gravity 12.94 m/s2 (1.32 x earth)

• Rock Planet
• Orbital Radius 1.51 x 10^9 km (10.08 AU)
• Period 2.00 x 10^5 hours (22.93 earth years)
• Gravity 11.00 m/s2 (1.12 x earth)
• Special Trace atmosphere

• Ice Planet
• Orbital Radius 2.68 x 10^9 km (17.91 AU)
• Period 4.75 x 10^5 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 10^9 km (36.86 AU)
• Period 1.40 x 10^6 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 10^6 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 10^7 hours (1231.19 earth years)
• Gravity 11.64 m/s2 (1.19 x earth)
• Heavy volcanism