# Blue Marble — Earth from Apollo 17

## Scene Characterisation

| Property | Value |
|----------|-------|
| Environment | Space |
| Domain | SPACE |
| Setting | Low Earth orbit, ~29,400 km altitude |
| Time of Day | N/A (sunlit hemisphere) |
| Weather | Cloud systems visible (Antarctic ice cap, cyclone patterns) |
| Mood | Awe, overview effect, fragility |

## Key Elements
1. **Earth** — full disk, sunlit, Africa and Arabian Peninsula facing camera
2. **Cloud systems** — swirling cyclones, Antarctic ice sheet, equatorial clouds
3. **Oceans** — deep blue, Indian Ocean dominant
4. **Continents** — Africa (Sahara tan, sub-Saharan green), Madagascar, Arabian Peninsula
5. **Antarctica** — bright white ice cap at bottom
6. **Black space** — pure black background, no stars (exposure for sunlit Earth)
7. **Atmospheric limb** — thin blue haze at Earth's edge

## Brain Config
```bash
python -m brain \
    --reference benchmark/references/space/blue-marble/nasa-apollo17-blue-marble.png \
    --domain SPACE \
    --llm claude --tier opus \
    --max-iterations 20
```

## What Success Looks Like
- Full Earth disk against black background
- Correct continent shapes and colours (Africa centred)
- Realistic cloud patterns with depth
- Thin atmospheric haze at limb
- Correct blue ocean colour gradient

## Licensing
- **Category**: public-domain
- **License**: Public Domain (US Government work)
- **Attribution**: NASA/Apollo 17 crew (Harrison Schmitt or Ron Evans), December 7, 1972
- **Attribution Required**: No (public domain), but credit NASA by convention
- **Source**: https://www.nasa.gov/multimedia/imagegallery/image_feature_329.html
- **Archive**: https://web.archive.org/web/20160112123725/http://grin.hq.nasa.gov/ABSTRACTS/GPN-2000-001138.html
- **Original Filename**: GPN-2000-001138 / File:The Earth seen from Apollo 17.jpg
- **Location**: 26°19'49"S, 37°25'13"E (camera position)
- **Notes**: One of the most reproduced photographs in history. South Pole originally at top; this is the widely-distributed rotated version.