Earth

Earth was a terrestrial planet located in the Orion-Cygnus arm of the Milky Way galaxy. It was the third planet from the star which it orbited, and its mass, climate, gravitational pull, magnetic field, and atmospheric pressure were ideal for sustaining carbon-based life. As such, the Cthilinianth made use of the planet for an experiment shortly after terminating a similar experiment on the neighboring world of Mars.