Not super rare, but not super common either. Planet size mostly runs on chance

i thryed and not any colonised lots of times

Like I said, it runs on chance. You can't predict what size you'll get

can i know the chance to get a 400 field i would also like to know which field in solar system has the most chance to get a 400orplus because that i dont found any 400 field max i found 325

From experience, the best chance of finding a big planet relies on the slots 5, 6, and 14. As the other people in the post have already stated.

The with good luck you could score a massive planet. But, luck is the word, it's all luck.

ok ty i want only 400+less like 390 no 9planet left to colonise

Look in other systems for more slots

i know thas why did im recolonising. i colonised evry each galaxy in time whit 4 5 6 400+

thats soooooooooo long

still not any