Earth could fit 50 of its moons inside it. The diameter of Earth is 12,742 kilometers, while the Moon's is 3,474, which makes the Moon about 27 percent of the size of Earth. It would require 81.5 Moons to equal the mass of Earth because Earth is more dense.
Earth's moon is smaller than the United States in diameter. The Moon also has no atmosphere and one-sixth of the gravity of Earth. According to NASA, the Moon is approximately 4.5 billion years old, and it likely formed from the leftover damage when a celestial body about the size of Mars collided with Earth.