After reading the thread "why didn't the gravity of cybertron rip the earth apart", I was more confused. In the movie, when Cybertron showed up in the sky, it was only a portion of it, so the earth was not violently injured. But, what if Autobots failed to stop Sentinel and the Decepticons? If the whole body of cybertron was teleported here, what was the use of earth and the 60 billion slaves on it since they would all be gone by the gravity of cybertron. So, what was the use of earth if the teleportation was complete? Why Sentinel didn't simply teleport the whole earth (including its creatures and the atmosphere) to Cybertron? That would be easier if they were truly desperate for the slave labor on earth.