Why does the Earth have a moon?

Our moon is literally a chip off the old block, formed around 4.5 billion years ago when a roving ‘’rogue planet’’ the size of Mars collided with the infant Earth and knocked a cloud of debris into orbit. That debris scrunched down into the ball of rock, becoming our moon. But it’s hardly the only moon in the solar system. Roughly 140 natural satellites (another name for moons) orbit the other seven planets, but ours is the only one known simply as ‘’the moon.’’ It’s also the only heavenly body visited by human beings.


Picture Credit : Google