Across
- 2. Celestial path that isn't quite a perfect circle
- 5. Planetary lightweight that could theoretically float in a bathtub
- 7. Target of the historic 1965 Mariner 4 flyby photo mission
- 8. The solar system's fastest traveler, chronologically speaking
Down
- 1. Demoted icy world discovered by Clyde Tombaugh in 1930
- 3. Jovian feature raging since at least the telescope's invention
- 4. Greenhouse effect run amok, closest to us
- 6. Cardinal directions spin backward on this icy giant