The Moon or Earth-Moon is a galactic body that orbits the planet and travels like a long-lasting primary satellite. It is the fifth largest satellite in the Solar System and the largest among satellite satellites compared to the size of the orbiting planet. It was believed that it was formed when a large stone was crushed on Earth, shortly after Earth began to build about 4.5 billion years earlier. The Moon was discovered in 1610. It is 384,400 kilometers from Earth