The Sun and the planets
The Sun is about a thousand times larger than all the planets together. Its gravity force attracts the planets, causing them to turn around in elliptical orbits. The nine planets are divided into two groups: four small, rocky, near the Sun, and four large and gaseous, further apart. Pluto is a puzzle because it does not fit into any of the groups and there is no consensus in the scientific community regarding its nature.
Mercury - is the fastest planet of the Solar System and is also what is closest to the Sun Do not have atmosphere and its surface is very similar to the Moon..
Venus - a planet that is often mistaken for a star, because then the moon is the brightest object in the night. The large carbon dioxide concentration in its atmosphere results in the greenhouse effect responsible for the high surface temperatures of the planet.
Earth - also called blue planet, owes its brilliantly colored to large bodies of water that cover most of its surface. We can only see a third of its solid surface; the rest is covered by seas, oceans and large bodies of ice of the poles, the ice caps. It is the third planet orbiting the Sun, after Mercury and Venus. Has a natural satellite, the Moon.
