Scientists from Harvard University say they have found evidence that an ancient Earth exists within our planet. According to a team of researchers, a previously unexplained isotopic ratio from within the Earth may be leftover material from an ancient Earth 4.5 billion years ago. The ancient Earth collided with a huge celestial body that eventually led to the creation of Earth’s moon, the scientists say. Ancient-code.com reports: The creation of Earth’s Moon and its origin are among some of the greatest scientific mysteries of science. While we are still unsure as to how the moon formed, there are several scientific theories which attempt to explain the formation of Earth’s ‘natural’ satellite. Among the theories, the most widely accepted one suggests that the Moon formed some 4.5 billion years ago when our planet collided with a celestial object the size of Mars called ‘Theia.’ According to this theory, the heat generated by the cosmic collision melted the planet causing debris to fly off, eventually creating the moon we see today. However, according to Harvard scientists led by Professor Sujoy Mukhopadhyay, there is enough evidence to suggest only part of the Earth melted and that an ancient part still exists within Earths mantle. [...]