Question

planet in solar system( fairly ____)

Answer 1

It seems you're looking for a word to describe a planet in the solar system that fits the phrase "fairly ____." One possible word to use could be "stable," as it describes the relatively stable orbits and conditions of the planets in the solar system. You could say, "planet in the solar system (fairly stable)."

If you have other characteristics in mind or need a different context, feel free to provide more details!