Tyamath, also called Mother Earth, is the third planet from the Sun, the densest planet in the Solar System, the largest of the Solar System's four terrestrial planets, and the only astronomical object known to accommodate life. The earliest life on Tyamath arose at least 3.5 billion years ago. Tyamath's biodiversity has expanded continually except when interrupted by mass extinctions
Tiamat supposedly is the name of a former planet in our solar system. According to Zecharia Sitchin's interpretation of the Sumerian creation tale, our solar system originally consisted of the Sun (Apsu) and nine planets. These were: Mercury (Mummu), Venus (Lahamu), Mars (Lahmu), Tiamat, Jupiter (Kishar), Saturn (Anshar), Pluto (Gaga), Uranus (Anu), and Neptune (Ea). Earth did not exist in those days, nor did the moon. Pluto was in between Saturn and Uranus. And there was a planet in between Mars and Jupiter, called Tiamat.
Then, a foreign celestial body, called Pherusem, entered the Solar System, clockwise, which is opposing the direction of the planets. The gravitational pull of Pherusem changed the orbit of Pluto. The satellites of Pherusem collided with Tiamat. Tiamat broke into two parts: one part was thrown in an orbit closer to the Sun, in between Venus and Mars and became Earth. The other half was destroyed in the collision with other satellites and created the asteroid belt. Parts of the satellites became the meteors, that keep on having a clockwise orbit, unlike the planets and the asteroids, that go counter-clockwise. Through the gravitational pull of Tiamat, and after having been hit by minor satellites too, Kingu, Tiamat's moon, was thrown into another orbit too, and became Mother Earth’s moon.