Final Answer:
The correct order of planets from largest to smallest radius is Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, and Mercury. Thus the correct option is A.
Step-by-step explanation:
The radius of a planet is a fundamental measure of its size, and to determine the correct order, we can rely on astronomical data. According to scientific measurements, the planets' radii are as follows:
- Jupiter (RJ) has the largest radius.
- Saturn (RS) comes next.
- Uranus (RU) follows Saturn.
- Neptune (RN) is then ranked.
- Earth (RE) comes after the gas giants.
- Venus (RV) is smaller than Earth.
- Mars (RM) has a smaller radius than Venus.
- Mercury
has the smallest radius among the listed planets.
By applying these radius values, the correct order is A. Jupiter, Saturn, Uranus, Neptune, Earth, Venus, Mars, Mercury. This order aligns with the scientifically measured sizes of the planets, reflecting their respective radii accurately.
Understanding the relative sizes of planets is crucial in astronomy and astrophysics, providing insights into their compositions, densities, and overall characteristics. The correct ranking in terms of radius helps build a foundational understanding of the solar system's diverse celestial bodies and their spatial relationships.