The History of Cybertron (Transformers G1 Cartoon)
110The History of the Transformers
Cybertron appeared considerably smaller than the planet Earth. Entirely metallic on the surface, some of the lowest levels of Cybertron consisted of rock and dirt, suggesting an organic beginning to the planet. Its gravity was light enough that humans were able to traverse the surface without any trouble, and it possessed 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. Many levels below the surface were the energy-furnace, the Plasma Energy Chamber, and at the heart of the planet was the spherical mega-computer, Vector Sigma.
Info from: https://transformers.fandom.com/wiki/Cybertron_(planet)
Background from: https://www.youtube.com/user/Royaltyfreetube/videos