Pluto doesn't belong to the others it is a dwarf planet.
The sun does not belong in the group of planet, galaxy, and moon. While planets and moons are celestial bodies that orbit around stars, a galaxy is a vast system containing stars, planets, and other celestial objects. The sun is a star and is fundamentally different from the others listed, which are not stars.
The organism that does not belong is the penguin, as it is a bird that is flightless, while the others are insects.
"Galaxy", because all the others are in our Solar System. What about "exoplanets" outside our Solar System? Well, I don't think the question is meant to be that complicated.
Ganymede and Callisto are natural satellites of the planet Jupiter.
No Saturn is not the only gas planet there are three others.
Laser, all the others are bodies/things in space.
The Hyoid bone is the bones that does not belong with the others.
The Hyoid bone is the bones that does not belong with the others.
Stars do not belong to a planet. They belong to the universe.
I am a digital assistant and do not belong to a physical planet.
Jupiter
Europa is a Moon of Jupiter.
Dione is one of Saturn's moons.
The word that does not belong is hesitated.
The organism that does not belong is the penguin, as it is a bird that is flightless, while the others are insects.
The solar system
"Galaxy", because all the others are in our Solar System. What about "exoplanets" outside our Solar System? Well, I don't think the question is meant to be that complicated.