Exoplanets: HD 40307 g

• Planet: HD 40307 g
• Sequence: 16
• Saved image path: My-Library/Images/Collections/Exoplanets/Images/Exoplanets_16-HD-40307-g.png
• Model: built-in gpt-image (recovered from session transcript)
• Generation date: 2026-07-18

Planet Profile

• Planet type: Super-Earth candidate
• Host star: K2.5 orange dwarf
• Estimated mass: ~7 Earth masses
• Orbital period: ~198 days
• Located near the star's habitable zone
• Atmosphere: Unknown

Environment

• Gravity: High (estimated 1.8–2.2g)
• Light: Warm orange sunlight
• Surface: Likely rocky
• Climate: Potentially temperate if a substantial atmosphere exists
• Weather: Unknown

Creature Design Direction

Large grazing megafauna with extremely strong skeletal structures, broad feet for stability, and thick skin adapted to high gravity.

Planet / Habitat Depicted

A rugged rocky high-gravity super-Earth surface under warm orange dwarf light, with compact vegetation analogues, heavy mineral ground, atmospheric haze, broad footprints, and a six-legged armored grazing herbivore braced against the terrain.

Sources

• Data provided in the collection plan (Prompts/generate-exoplanets-collection.md); measurements are from published exoplanet catalogs. No web research performed for this collection.

Final Prompt Used

Create a scientifically plausible alien creature from HD 40307 g.
A scientifically plausible alien herbivore from HD 40307 g, high-gravity rocky super-Earth orbiting an orange dwarf, massive muscular body, six pillar-like legs, thick armored hide, grazing beneath orange skies with rugged mountains, realistic astrobiology illustration.

Requirements:
- Body plan reflects the planet's high gravity, estimated around 1.8 to 2.2g: the creature is low, broad, extremely muscular, with reinforced skeletal structure, six thick pillar-like legs, broad feet for stability, and no fragile tall limbs.
- Sensory organs reflect warm orange K2.5 dwarf light: protected side-set eyes with amber low-glare membranes and subtle sensory ridges.
- Skin and armor reflect a potentially temperate rocky world with unknown atmosphere: thick leathery armored hide, dust-worn plates, protected nostril vents, and heat-regulating folds.
- Locomotion fits rugged rocky terrain: the creature braces its feet on uneven stone while grazing from tough low vegetation analogues.
- Depict the planet as well as the creature: show a high-gravity rocky super-Earth landscape with rugged mountains, heavy rounded boulders, compact wind-shaped plant analogues, orange sky, warm orange sunlight, atmospheric haze, distant horizon, and textured mineral ground.
- The environment should communicate a rocky high-gravity habitable-zone candidate even without captions.
- Make creature and environment feel physically connected: broad footprints pressed into dusty mineral soil, grazing posture, disturbed pebbles, and weight-bearing stance.
- Use a surface-level habitat view. Do not show the planet itself as a separate sphere in the sky; do not add unexplained moons or extra planets.
- Avoid humanoid anatomy unless scientifically justified.
- Show the creature in its natural habitat with enough space in the frame to read the world around it.
- Style: natural-history field-guide illustration, realistic scientific/anatomical detail, documentary lighting, one unified scene.
- Composition: 3:2 wide landscape; balance a clear creature portrait with a readable planetary landscape. Do not crop so tightly that the world is reduced to a blurred background.
- No text or labels baked into the image. No official logos, no photorealistic real people.