The sun is at the center of the solar system and is the primary energy source for life on Earth. It is about 109 times the diameter of Earth and has remained stable for the past 4 billion years and is expected to remain stable for another 4 billion years. The moon is one of the largest natural satellites in the solar system and formed approximately 4.5 billion years ago shortly after Earth. The moon's gravity causes ocean tides on Earth. Earth is the third planet from the sun, formed about 4.54 billion years ago, and is the only known planet that supports life. Life first appeared in Earth's oceans and 71% of Earth's surface is covered with water.

1. Miguel Casas Fdez

3.  The sun is the star at the center of the Solar System
and is the most important source of energy for life on
Earth.
 Its diameter is about 109 times that of Earth.
 The sun has not changed dramatically for four billion
years, and will remain stable for another four billion
years.

5.  The Moon is one of the largest natural satelites in the
Solar System.
 The Moon was formed approximately 4.5 billion years
ago, not long after Earth.
 The Moon´s gravitational influence produces the
ocean tides.

7.  Earth is the third planet from the sun and the only one
known with living things.
 Earth was formed about 4.54 billion years ago.
 In the begining life appeared in its oceans .
 Seventy-one percent of Earth´s surface is covered with
water.