Gas Giant

Gas Giants are very bigger than the Super earths.

Visit
Humans can't go there it's way too dangerous and it's have large clouds.

Humans uses the moons to colonize for them they terraformed and have growed a new life.

Gas Giants with aliens
I don't think so they were way too danerous for other aliens.

Contract the aliens
We don't speak their language they never speak cause they don't know our languages so they invade their place one by one on the moons.

Space Empires
Others are too alienish and ikt's not speak our language.

Space pirates
Steal, destroy their colonies for ever it's random for every planets.

Traps
Space pirates are anywhere humans destroy them and captured colonize.