The Tenth Doctor confirmed that the Sense Sphere was located in the same star system as the Ood Sphere. (TV: Planet of the Ood) It had two suns, which meant the planet never had natural night-time. Its atmosphere was thick, which meant sound waves on the planet were increased in volume. The planet was also riddled with caves, which is where the Zilgans lived. (PROSE: The Monsters from Earth) It was also rich in molybdenum. (TV: The Sensorites)