Cybertron

Entirely metallic on the surface, some of the lowest levels of Cybertron consist of rock and dirt, suggesting an organic beginning to the planet. Its gravity is light enough that humans are able to traverse the surface without any trouble, and it possesses a breathable atmosphere. Water, or at least a substance resembling it, was in evidence on the planet—lakes and rivers have been shown to exist, albeit sparingly. One of the local animals can imitate the shape and sounds of any creature, even a sentient one. The air is filled with a thick haze of hairs.