SOLAR SYSTEM

Detailed explanation-1: -Consequently, the density of the inner planets is greater than that of the outer planets . Despite the density differences, the mass is smaller for the inner planets than the outer planets. One suggested reason for this is that the rocky planets have a iron core whereas the outer planets may not.

Detailed explanation-2: -The giant planets are less dense overall because they are made mainly of gases, and the inner rocky planets are more dense because they are made mainly of rock.

Detailed explanation-3: -Mercury and Earth are the densest planets in the Solar System (Figure 13) with densities similar to the iron-rich mineral haematite. Saturn, the least dense planet in the Solar System on the other hand, has a density lower than that of water.

Detailed explanation-4: -Rocky planets are smaller than gas planets, but are made of heavier materials. There are four rocky planets in our Solar System: Mercury, Venus, Earth, and Mars. They are the closest planets to the Sun, and so are sometimes known as the inner planets.

Detailed explanation-5: -The Inner Planets All are solid, dense, and rocky. None of the inner planets has rings. Compared to the outer planets, the inner planets are small. They have shorter orbits around the Sun and they spin more slowly.