Also known as RS 8409-1405-8-11441257-1380 5 in 0.9.7.4 beta patch 7.
Perhaps the most Earth-like system that forms a double planet system between itself and its moon Keila. Like the Earth's moon Luna , it is on a elliptical orbit that makes it appear larger and smaller over a period of 19 days (the time it takes Keila to orbit and rotate) in Tailey's sky. However, its orbit is far more elliptical than Luna with an eccentricity value of 0.254, making it appear larger than Luna might in Earth's sky.
The planet is the homeworld to the Ayesse, an early Type I civilization who have explored their entire solar system with manned and unmanned missions and colonized their moon Keila and most of the rocky planets. They have also begun plans on a Dyson Sphere which will surround their orange dwarf star, collecting trillions of watts of energy every day. Construction on the Dyson Sphere will begin in 10,200 CE and is estimated to be completed by 11,000 CE, taking an entire 800 years to build the sphere.
Tailey has a diameter of 6390 km, exactly 50% of Earth's diameter. It has 11% of Earth's mass, which gives the planet a gravitational pull of 0.47 g. Tailey is 11.5 billion years old, making it twice as old as the Earth. Due to this, its rotation period has slowed down between a gravitational tug between Keila and its star Leka. Due to a lower gravitational pull, animals have thinner and longer legs.
Due to all of these parameters, Tailey has an ESI of 0.825.
Tailey has only one moon called Keila on a elliptical orbit, also creating a barycenter between the two major bodies. Small asteroids, the order of years, enter the Tailey sphere of influence and temporiarly becoming a dwarf moon for a short time until ejected back into the solar system on a very different orbit.
Keila was formed in a similar way to Luna during a planetary collision in the early stages of the solar systems formation. Another planetoid had hit the planet and created a ring of debris around Tailey which, over a million years, formed three small spherical moons which soon collided together to form an even bigger moon to become the moon Keila as seen today.
In modern days, Keila has been colonized by over 10 million Ayesse living in domed cities, blocking them from solar radiation and the vaccum of space since Keila is airless.