Stars

Introduction

Humans are always trying to understand the universe that surrounds us in order to use it for our own benefit, but there is something that we are not aware of, since we see the naturethat surrounds us very different and unattached from us; when in fact it is enough to look up at stars so that we can realize that we are all connected to each other, and that we are not verydifferent from each one another, because as well as the Human’s life process are comparable to the Stellar Evolution stages as both processes have a similar beginning, development and end.

A star’sbeginning and a human beginning may seem completely different, yet if we analyze them closely we will realize they are quite similar. Stars birthplace is in the spiral arms of galaxies where dense clouds ofgas are located, just like a human’s birthplace is the womb. These regions of dense clouds will eventually collapse and form a “protostar”, which is considered the beginning of a star’s life. Thecontraction of this gas will rise the temperature until it reaches the 1,000,000°C (about 1,800,000°F). At this point a nuclear reaction takes place in which the hydrogen atoms combine with deuterons(nuclei of so-called heavy hydrogen atoms) and form gas helium. This liberates bit amounts of nuclear energy and then the star becomes a “main sequence star”, just like humans take energy from theirmother until they are born. The next stage of the star will be childhood for a human. Once the star is a sequence star it is just like a new born. For some million years the star will continue burningHelium and therefore it will become brighter and its color will increase more.

Soon the star will reach its teenager years. Just like humans eventually stop growing, stars sooner or later exhausttheir hydrogen supply. By the time this happens, the star will become redder, larger and more luminous: it becomes a red giant star. Teenage years are short, and just like humans, stars adulthood years...