From the Big Bang to the Birth of Planet Zi

    The Beginning of the Universe: The Big Bang

    12 billion years ago, a miniscule amount of "cosmic particles" caused a major expansion, and the "universe" was born.

    This huge explosion that created the universe is called the "Big Bang". The matter released at this time eventually gathered together due to its own gravity, forming groups of small, heavy "gas clouds".

    These contracted at an accelerating rate and grew into galaxies.

    About 7 billion years after the Big Bang, in a galactic arm 30,000 light years from the centre (or "bulge") of the Milky Way, in a symmetrical region of space directly across the bulge from our own solar system, a new star system was about to be born.

    Dust and gas drawn together by gravity formed a disc-shaped cloud and began to rotate. The centre grew into an F-class yellow-white star, and "Planet Zi" was born as the first planet orbiting around it. This occurred approximately 5 billion years ago.

- Diagram

    Vortex of Gas: Rocks, ice, dust, and gas collide and produce energy.    Planetary Collision: The broken pieces are fragments of Planet Zi's moon.
    The Zoid Galaxy is born.    Planet Zi.

- The Birth of Planet Zi

    The protoplanet Zi drew in nearby asteroids through gravitational attraction, growing to a diameter of 10,000 kilometres. It was in a fireball-like state, with its surface temperature at 6000 degrees Celsius and all its component matter molten.

    100 million years later, the ground finally began to cool, and with its surface covered in hard, jagged rocks, Planet Zi was a stable, dead world. But one day, 200 million years after its birth, the massive planet "Mi", which was as much as a quarter of Planet Zi's diameter, collided with Zi.

    Due to the damage, Zi was on the verge of complete collapse. A quarter of Zi's crust was blasted off into space, and the colliding planet itself was added as a new part of Zi. In addition, the parts of Zi's crust that had been blasted into space and the fragments of the colliding planet continued to follow a satellite orbit around Zi, eventually becoming the three natural satellites "De", "Se" and "Ae". Most of the constituent elements of this planet that collided with Zi were heavy metals, and it is thought that 78% of the heavy metals currently existing on Zi were brought by this planet.

    Due to the collisional energy of this planet, Zi once again became a fireball, and its surface was covered with molten heavy metals, as if it were a blast furnace. Its strongly acidic atmosphere and ammonia-dominated seas were hell incarnate, and its environment continued to be far from suitable for the origin of life. Although the planet's crust eventually began to solidify again, large quantities of minute metal particles had been released into the atmosphere during the planetary collision, and these remained in the skies of Zi for countless millennia. As a result, the high-temperature infrared rays emitted from the surface were intercepted, causing a lasting runaway greenhouse effect, and even after it entered a stable period, Zi had an atmospheric temperature of 160 degrees and a pressure of 60 atmospheres, an environment unsuited to the origin of life.

    However, "thermophilic" bacteria were born in its hot seas. These bacteria self-replicated within the toxic hydrogen sulphide of submarine volcanoes, and cleverly chemosynthesised the heavy metals in the seawater to produce movement energy. With this tough life force, they gradually built up their numbers in the depths of Zi's hot seas.

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