30+ AI Space Prompts for Stunning Cosmic Images (MJ, DALL·E, SD)

Galaxies, nebulae, and faraway planets always look epic, and AI tools make it incredibly simple to turn a small idea into something breathtaking. Whether you're creating wallpapers, concept art, or just exploring your imagination, the right prompts make all the difference.

In this guide, you’ll find 30+ carefully crafted space prompts you can use across MidJourney, DALL·E, and Stable Diffusion. I also included a quick comparison table so you can choose the tool that best fits your style.

Which AI Tool Is Best for Space Images?

Here’s a simple breakdown if you’re deciding which platform to use:

In short:

• MidJourney is perfect if you love eye-catching visuals.
• DALL·E is great for clean, well-balanced scenes.
• Stable Diffusion is unbeatable if you want total control.

Now — let’s get into the prompts!

10 Best Space Prompts for MidJourney

Great for: cinematic, artistic, detailed, dramatic outputs

• Ultra-detailed spiral galaxy with glowing purple and blue nebula clouds, cinematic lighting, 8K, volumetric light —v7

  

• Astronaut floating above Earth at sunrise, hyper-realistic textures, dramatic rim light —ar 16:9 —v7

  

• Massive star cruiser flying through an asteroid belt, highly detailed metallic surfaces —q2 —v7

  
• Two suns rising over an alien desert planet, floating rock formations, surreal 35mm shot —v7
• Dragon-shaped red nebula with glowing cosmic dust, HDR lighting —v7
• Neon-ringed space station drifting above Saturn, ultra-sharp details, atmospheric glow —ar 21:9 —v7
• Astronaut discovering an ancient alien monolith on a frozen moon, dramatic composition —v7
• Gigantic gas giant with swirling storms and bright auroras, cinematic realism —v7
• Close-up of star formation inside a nebula, detailed cosmic dust, long-exposure effect —v7
• Dreamlike cosmic landscape with floating temples and glowing meteors, soft sci-fi fantasy —v7

10 Best Space Prompts for DALL·E

Great for: clean composition, clear subjects, natural balance

• A bright blue nebula shaped like a phoenix, sharp stars, smooth cosmic lighting.
• Astronaut standing on an icy moon with a giant planet rising behind them, crisp and realistic.
• Futuristic space station orbiting Jupiter, symmetrical design, clean geometric lighting.
• Alien world with glowing rivers, crystal mountains, and a calm panoramic skyline.

• A spiral galaxy hovering over a desert landscape, surreal but clean composition.

  
• Mars rover exploring a dusty red planet, soft natural lighting, documentary style.
• Minimalist deep-space scene with a single bright star and smooth nebula gradients.

• Earth seen from the ISS window, soft reflections, realistic lighting and textures.

  
• Space elevator stretching from Earth to low orbit, clean futuristic engineering look.

• Two astronauts planting a glowing alien crystal, balanced lighting, vivid but natural colors.

  

10 Best Space Prompts for Stable Diffusion

Great for: stylized art, custom models, creative freedom

• Deep-space nebula in vivid magenta and cyan, volumetric dust, astrophotography detail, 8K.

• Astronaut exploring an abandoned alien temple, dark sci-fi mood, subsurface scattering effects.

  
• Enormous planet eclipsing a red dwarf star, dramatic shadows, cinematic CG render.

• Realistic black hole with warped starlight, accurate gravitational lensing visuals.

  
• Floating bioluminescent coral reefs in space, surreal dreamlike palette.

• Starship cockpit POV flying through a nebula, holographic controls, sharp sci-fi tech textures.

  
• Ancient alien ruins built on an asteroid, glowing symbols, detailed rocky surfaces.
• Astronaut walking inside a swirling wormhole tunnel, chaotic energy, bright neon streaks.
• Futuristic city built on a meteor, neon reflections, hyper-detailed sci-fi environment.
• Colorful supernova explosion with shockwaves and cosmic debris, dynamic motion and contrast.

Tips for Getting Even Better Space Images

A few simple tweaks can dramatically improve your results:

• Use lighting cues like volumetric light, cosmic glow, rim light, or lens flare
• Try different camera angles — close-ups, ultrawide, POV, aerial shots
• Mix in color palettes (violet, cyan, neon magenta) for stronger drama
• Stable Diffusion users: experiment with LoRA models or custom checkpoints
• MidJourney users: switch aspect ratios like 16:9 or 21:9 for cinematic scenes

Conclusion

Space prompts are some of the most fun prompts to experiment with, and the results can be incredibly beautiful. Whether you’re using MidJourney, DALL·E, or Stable Diffusion, the prompts above will help you create cosmic scenes that look straight out of a sci-fi film.

Feel free to mix them, tweak them, or build your own — the universe is literally endless.