Vast futuristic spaceport city perched on a green world

A sprawling, beautiful space port city resting on a cliff of a gigantic chasm on a green planet. The city sprawls for miles in each direction and has many spaceports on huge platforms lined up along the length of the city. The architecture of the city is smooth and sculpted revealing a very advanced civilization. There are space ships coming and going from all the space ports lined up along the massive, beautiful city. The image is done in a fantastic, futuristic science fiction style