Showcasing Various Alien Constructions for My Futuristic Space Exploration Strategy

Create an image showcasing various alien constructions for my futuristic space exploration strategy game. The image should include a glowing energy tower, a hovering biodome, a sleek starport, and a bustling galactic trade hub, arranged within four separate quadrants against a transparent background. The design should incorporate intricate sci-fi voxel aesthetics, realistic shadowing, detailed textures, and vibrant neon hues that align with the game's extraterrestrial theme.