Has the Earth ever had more than one moon in history?
Around 4.5 billion years ago, when the Solar System was brand new, Earth shared its orbit with another planet. This planet, Theia, was about the size of Mars….
We are full of curiosity about the world, so we have countless questions every day. If you have the same question, you can come here and see how many people in the world share your curiosity. To understand the world is to understand ourselves.