Which planet in our solar system has the most moons?

• A. Jupiter
• B. Saturn
• C. Mars
• D. Venus

Answer: (A)

The main idea here is that a planet’s number of moons depends on its size and gravity. Giant planets have strong gravity that can capture and hold onto many small objects as moons, and they tend to remain able to keep them over long periods. Jupiter is the largest planet in our solar system, so its gravity can latch onto and retain a huge variety of satellites. As humanity has observed and studied the outer solar system with better telescopes and spacecraft, many moons have been identified around Jupiter, pushing its total higher than any other planet. That’s why it’s the best answer. Saturn also hosts a massive moon system, and discoveries have added to its count, but Jupiter currently has the most known moons. The inner rocky planets don’t have that advantage: Mars has two small moons, while Venus and Mercury have none, so they don’t come close to Jupiter’s moon tally.