Answer:
1. closest to the sun: Mercury
2. retrograde rotation: Venus
3. wobble stabilized by the moon: Earth
4. floodplains indicate past water: Mars
5. most massive: Jupiter
6. least dense: Saturn
7. axial tilt almost 90°: Uranus
8. predicted by mathematical calculations: Neptune
Step-by-step explanation:
The solar system comprises of the sun, the eight planets, and the heavenly bodies. The Sun is the largest heavenly body. The eight planets have distinct characteristics and features which makes them different from each other. The first four planets, Mercury, Venus, Earth, and Mars are classified as inner plants. Jupiter, Saturn, Uranus, and Neptune are classified as outer planets. The planets are made up of rocky materials, gases, and metals.