Until now there was a debate between two theories: one that proposed that the rocky planets originated from material from the inner Solar System; and a more recent one that pointed to fragments of the outer Solar System About 4.6 billion years ago, in the early days of our Solar System, a disk of dust and gases orbited the young Sun. Humanity has come up with two theories as to how the rocky planets, including our home, arose from that cloud. the Earth. The …