Gliese 581d
Gliese 581 D was one of Earth's first colonies settled after Earth's population had been evacuated. The planet that supported the colony was 20 light-years from Earth and had twin suns.
When Bill asked the Twelfth Doctor travel to the future with her, he took Bill to Gliese. (TV: Smile)
Landscape
Gliese was very similar to Earth. Its sky was blue. However, it had two suns, indicating it was part of a binary star system. It had seas of water and an atmosphere that made it habitable for humans. The city that would serve as the home of the colonists was surrounded by vast fields of wheat. The architecture of the city was made up of futuristic and smoothly designed buildings with many windows and an overall white color. It has numerous plants and bodies of water flowing through the streets in order to make the place a utopia.
