Question

which of the following is a common trait of all the outer (jovian / gas giant) planets?
jupiter
(89,000 mi
143,000 km)
saturn
(74,900 mi
120,600 km)
neptune
(31,000 mi
50,000 km)
uranus
(32,000 mi
51,000 km)
they have both many moons and ring systems around them.
they have many moons.
none of the listed answers; saturn has rings while the rest have many moons.
they have ring systems around them.

Explanation:

All the outer (Jovian/Gas Giant) planets (Jupiter, Saturn, Uranus, Neptune) have many moons. While Saturn is most famous for its prominent ring system, Jupiter, Uranus, and Neptune also have ring systems (though less prominent). But the key common trait among all four is having many moons. For example, Jupiter has dozens of moons (like Io, Europa, Ganymede, Callisto), Saturn has many (such as Titan), Uranus has moons (e.g., Titania), and Neptune has Triton and others.

Answer:

They have many moons.