Let's Begin1 of 3
Our Solar System
The solar system has 8 planets orbiting the Sun. The 4 closest to the Sun are the inner planets: Mercury, Venus, Earth, and Mars. They are small and rocky.
Loading...
Science — Planets and the Solar System
The solar system has 8 planets orbiting the Sun. The 4 closest to the Sun are the inner planets: Mercury, Venus, Earth, and Mars. They are small and rocky.