It is said that before time began, there was the Cube. With the power to create worlds and fill them with life, it gave birth to the inhabitants of Cybertron, who, for a time, lived in harmony, but like all great power, some wanted it for good, others for evil. And so began the war, a war that ravaged Cybertron until it was consumed by death, and the Cube was lost to the far reaches of space. The Cybertronians were scattered across the galaxy, hoping to find it and rebuild their home, searching almost every star, every world. A message of a new discovery drew them to the then unknown planet of Earth. But they were already too late.
Cybertron's upper layers seem to have a lot of interlocking hexagonal shapes, and several battles near the end of the war took place there. Sentinel Prime used these geographical features to his advantage when he attempted to escape Cybertron aboard the Ark. Later on, Sentinel Prime attempted to teleport Cybertron via the space bridge-forming pillars from his ship, the Ark in order to acquire Earth's resources to re-energize Cybertron. However, Bumblebee destroyed the master pillar and Cybertron collapsed as it was going through, presumably destroying Cybertron forever. Although, you never know, it could have just put a huge crater in it.
Notes & Trivia