Page:Illustrated Astronomy.pdf/17

 When the Sun was forming from its cloud, shrinking to be the size it is today, a minor part of this cloud created a disk around the Sun. Such disk originated all the planets in the solar system, from Mercury to Neptune. Every single one of them took remains of the material existing from the Big Bang, or that was once inside a star, and after thousands of millions of years, they condensed into a planet. Also, comets, asteroids, and the rest of the objects that we can find in the Solar System were formed, such as dwarf planets, where Pluto is the most known. Out of the eight planets that the Solar System has, in the third one closest to the Sun, life developed. In the beginning, 3 billion years ago, there were only bacteria, but this was increasing in time and diversifying. And today, as human beings, we can do research and understand how did we get here and amaze at everything that exists.