Theia is a hypothetical planet-sized body believed to have collided with Earth in the early stages of the solar system's formation. The impact of this collision is thought to have played a significant role in the creation of the Moon. However, since Theia is a theoretical construct and no direct observations or physical evidence of Theia exist, its exact appearance and characteristics are speculative.
Based on current scientific understanding, Theia would have been a planet-sized object, perhaps similar in size to Mars or even Earth. It would have possessed its own distinct geological features, such as mountains, valleys, and possibly even an atmosphere.
Theia is often depicted as a rocky or protoplanetary body with a solid surface, similar to other terrestrial planets in our solar system. Its composition would have likely included elements and minerals commonly found in rocky planets, such as silicates, metals, and possibly ice.
However, it's important to note that any depiction of Theia's appearance is purely speculative and based on scientific models and theories. The actual characteristics and appearance of Theia can only be inferred indirectly from the evidence gathered through geological and astrophysical studies, as well as computer simulations.