MTTC 103 Elementary Practice Exam 2025 – All-in-One Guide for Comprehensive Exam Success

Mercury is indeed the planet that does not have any moons. In the context of celestial bodies, moons are natural satellites that orbit planets. While larger planets like Jupiter and Saturn have multiple moons due to their significant gravitational pull, Mercury is too small and too close to the Sun to have captured any satellites. Its proximity to the Sun means any potential moon would be subjected to tidal forces that could destabilize its orbit, making it difficult for Mercury to retain any natural satellites.

Earth, on the other hand, has one moon, which is relatively large compared to the planet itself, while both Jupiter and Saturn possess numerous moons—Jupiter has more than 70 known moons, and Saturn has over 80. This highlights how different sizes and positions within the solar system affect a planet's ability to have moons. Therefore, the fact that Mercury does not have any moons is directly related to its physical characteristics and orbital dynamics.