Moon

The Moon is Earth's only natural satellite. In our solar system, it acts as a loyal companion, much like the moons orbiting Jupiter, but it is unique to us due to its proximity. It formed about 4.5 billion years ago, likely after a Mars-sized body collided with the young Earth. It is roughly four times smaller than our planet. Its gravity causes tides in Earth's oceans. The Moon has no atmosphere or light of its own; we only see it because it reflects sunlight like a giant space mirror.