Earth, Sun and Moon. Artwork of the Earth, Sun and Moon seen from space. Earth is centred on Europe. Earth is the third planet from the Sun. It is thought to be the only planet in the solar system that can support life. The Moon (upper centre) has a diameter just over a quarter of the Earth's. It orbits at a distance of around 385,000 kilometres, taking nearly 30 days for one orbit. It does not have an atmosphere and is a heavily cratered and barren piece of rock. The Earth-Moon system orbits the Sun (upper right) at a distance of 150 million kilometres. Nebulae (some in the background) are the birthplace of the stars and their planets.