Sleek futuristic alien metropolis of towering skyscrapers sits

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This retro-futurist science fiction illustration depicts a sprawling advanced alien city lined with glossy blue spires, domed structures, and elevated garden terraces. The gradient sky shifts from warm golden yellow at the horizon to bright clear blue overhead, populated by multiple large celestial orbs and smaller moons. The crisp painted art style evokes classic vintage sci-fi concept art, conveying a sense of awe and wonder at a thriving interplanetary civilization.