The moon, Earth's natural satellite, is significantly smaller in size compared to our planet. With a diameter of approximately 3,474 kilometres, the moon is about 1/4 the size of Earth, making it the fifth-largest moon in the solar system. Its smaller size contributes to its lower gravitational force, which is about 1/6th that of Earth's, influencing various aspects of its surface and geological features. How big is the moon compared to the Earth is a common query reflecting curiosity about celestial proportions.