Across
- 3. A large system of stars held together by gravity.
- 4. The gas that composes 24% of the atmosphere on gas giants.
- 6. The most massive planet in the solar system.
- 8. Planet Another name for gas giants.
Down
- 1. The second largest planet in the solar system.
- 2. Giants Jupiter, Saturn, Venus and Neptune are what?
- 4. The gas that composes 75% of the atmosphere on gas giants.
- 5. The gas giant that was discovered in 1846.
- 7. None of the gas giants have ______ surfaces.
- 9. Planets What Mercur, Venus, Warth and Mars are considered.