Final answer:
The statement that Saturn's semi-major axis is nearly twice that of Jupiter's is false, as Saturn's axis is larger but not double Jupiter's. Both planets comply with Kepler's Third Law.
Step-by-step explanation:
The claim that Saturn's orbital semi-major axis is almost twice Jupiter's is false. Saturn has a semi-major axis of 9.54 AU, while Jupiter has one of 5.20 AU. Although Saturn's semi-major axis is larger than Jupiter's, it is not quite double the size.
Applying Kepler's Third Law, we find that for Saturn, p² = 29.46 × 29.46 = 867.9 and a³ = 9.54 × 9.54 × 9.54 = 868.3. This means that Saturn's orbital period squared is nearly equal to the cube of its semi-major axis, showing its compliance with Kepler's Third Law. For Jupiter, p² = 11.86 × 11.86 = 140.74 and a³ = 5.20 × 5.20 × 5.20 = 140.60, also showing compliance with the law.