The solar system consists of the Sun and eight planets orbiting it. The Sun is a star that makes up 75% hydrogen and 25% helium and has a surface temperature of 5,500oC. It is one of about 100 billion stars in the Milky Way galaxy. The planets include Mercury, the closest to the Sun; Venus, the hottest; Earth, the 5th largest and our home; Mars, with the largest volcano Olympus Mons; Jupiter, the largest planet; Saturn, known for its iconic rings; Uranus, spherical in shape; Neptune, the eighth planet; and Pluto, now classified as a dwarf planet.

1. The solar system By Peem tangmo