Planet Phaeton was a mysterious and enigmatic world that once existed between Mars and Jupiter in the early days of the Solar System. Believed to be a rocky planet similar in size to Mars, Phaeton is often theorized to have been destroyed in a catastrophic collision that scattered its remnants across the inner asteroid belt. Tiamat, on the other hand, was a massive planet in the outer Solar System that served as the birther of the inner asteroid belt. It was believed to be a gas giant similar in size to Jupiter and existed beyond the orbit of Mars. Tiamat is said to have been involved in a violent collision with another celestial body, resulting in its destruction and the formation of the inner asteroid belt that we see today. Both Phaeton and Tiamat are now considered to be hypothetical planets, with their existence and destruction serving as intriguing mysteries in the field of planetary science.