Planet odf Origin: Andoria, The moon of a ringed gas giant Andor orbiting Epsilon Indi, a star located about 11.8 light years from Sol. Andoria is an ice world, with a human-breathable oxygen-nitrogen atmosphere. Andorian cities are underground and take their energy from geothermal activity. The cities are connected to each other by thousands of kilometers of tunnels. Only during rare heatwaves will the temperature on Andoria rise above freezing, and even then only for a few weeks at a time. During mid-summer, a temperature reading of -28° is not uncommon. (ENT: "The Aenar")
The Andorians are a humanoid species who developed the Andorian Empire, a space faring parliamentary democracy, lead by a chancellor. The Andorian Empire is a founding member of the United Federation of Planets in 2161.
Most Andorians are blue-skinned with white or silver hair. An Andorian subspecies called the Aenar had white skin, blind and telepathic. Both subspceies are genetically compatible. (ENT: "These Are the Voyages...") Andorians have two supercranial antennae that aid in balance. If one is lost it takes up to nine months to regrow. (ENT: "United")
Andorians are a militaristic race. They consider it an honor to serve in their Imperial Guard, and military rank greatly influenced social reputation. Deploring dishonesty -- and never fighting without reason -- Andorians are nonetheless capable of duplicity. Deeply emotional, passionate, even violent; they are not known for their charity or sympathy, but they place a high value on family. (TOS: "Journey to Babel"; TAS: "Yesteryear") Andorian weddings commonly require four people. Females enjoy an equal position in society. (ENT: "Proving Ground"; TNG: "Data's Day")
Source: Star Trek Universe.