Final answer:
Gas giants have many moons due to their strong gravitational pull and the process of co-formation during planet formation.
Step-by-step explanation:
Gas giants have many moons due to their strong gravitational pull. The gas giants, such as Jupiter and Saturn, have a large mass which creates a strong gravitational force that attracts nearby objects. This gravitational force can capture objects like asteroids and comets, causing them to become moons.
For example, Saturn has at least 82 known moons in addition to its rings. These moons include Titan, which is almost as big as Ganymede in Jupiter's system, and Enceladus, which has active geysers of water being expelled into space.
In addition to the gravitational capture of objects, the moons of gas giants can also form through the process of co-formation. This occurs when moons form alongside the gas giant during the planet's formation. As the gas giant collects material from the surrounding disk of gas and dust, some of that material can clump together to form moons.
Learn more about moons of gas giants