Question

Why do the gas giants have many moons?

Answer 1

the gas giant is Jupiter and Saturn
the ice giant is Uranus and Neptune

Answer 2

Answer:

• Gas giants are the largest planets, indicating that they formed in mass-rich parts of our solar system's early proto-planetary disk.  

• As giants collect stuff very well; most of Jupiter's ~67 moons are almost definitely captured asteroids and rock comets.

• Currently, all the gas giants are present in our solar system and these are very far from the Sun.
• This distant environment can be conducive to keeping satellites, as closeness to the Sun destabilizes tiny orbiting bodies through tidal interaction and photon pressure.
• It might not be a coincidence that there are no moons in Mercury and Venus.