When you colonize new planets, is it just random size or is it alread, pre, sized...? How big is one of the bigest planets ?

Planet size is randomized per system slot. Typically, there is a higher probability of getting a larger planet in system slots 4-7 (however there is also the probability that you will get a small rock).

I've seen people post planet sizes of 460 fields but I have no proof that is valid nor have asked the admins about it.

Planet field slot location also dictates output as well. A planet in a lower slot (1-4) will produce more crystal while a planet in a higher slot (9-12) will produce more deuterium (when compared to the middle slots).

I have personally seen my friends on his account with a planet of 478 fields, so yes, its huge but definatley exists.

-Istalris-

thax im going to go get a massive planet, lol