Planet

By scientific definition, a planet is any object orbiting a sun with an empty path and sufficient gravity to not tear apart or deform. However, the definition of "planet" used in Transformers context is a bit different. ANYTHING with gravity can be a planet, and oddly, they all seem to be about the same.

Major known planets
Over the course of the many continuities of Transformers, a lot of planets have been encountered, most of them sustaining life. Here are some of the more well-known planets prominently mentioned. It should be noted in some continuities, they are vastly different in atmosphere and gravitational pull, while in others, they're invariably JUST LIKE EARTH.


 * Earth - Most likely, you're on it.


 * Cybertron - The homeworld of the Transformers. According to which source you use, it is either much smaller than earth,  about equal to the Moon in size, or much larger, about equal to Saturn.  Regardless of the differences in gravity either size would cause, humans can walk on it with no problems.


 * Junkion - AKA the intergalactic junk yard. Looks more like a single continent than a whole planet (and probably wouldn't be considered a planet either, at least in real life).

Transforming planets
Some planets are known to be capable of transforming. The two most commonly known is Unicron. Whatever his origin, he is beyond legendary, with his stories heard throughout the universe, and not only by Transformers. The planet Junkion was SUPPOSED to transform, but the Junkions haven't quite worked out the kinks yet..