Across
- 2. the third brightest object in the sky
- 7. planets with no solid surface of any kind
- 8. a mixture of gases in a planets air
- 9. the most volcanically active moon in the galaxy
Down
- 1. planets that are small dense and rocky in composition
- 3. the westward loops of planet motion
- 4. patterns of stars in the sky
- 5. light bucket
- 6. the curve that represents spread of the intensity of radiation admitted