Zeroninth is the planet was truely born on. This is where Zari was hiding from his brother and created the Silver Star Dragon Balls. SS was just born so he didn't remember anything about the planet. It is possible the Dragon Balls are there. The planet is full of life,Like Earth. The civilians there bare a very similar resemblance to Humans. The planet resides in the far West Galaxy. It is untouched by King Cold or his men due to it having such a large amount of magic aura emitting from the planet and its Zeroninthians.