the stars

Although most of the space we can observe is empty, it is inevitable that we look at those little points that shine.
It is not that empty space lacks interest, that it has it. Simply, the stars attract attention.
Because of the gravitational attraction, the matter of the stars tends to concentrate at its center. But that causes its temperature and pressure to increase. From certain limits, this increase causes nuclear reactions that release energy and balance the force of gravity, so that the size of the star remains more or less stable for a while, emitting large amounts of radiation into space, including , of course, the luminous one.

However, depending on the amount of matter collected in a star and the time of the cycle in which it is, can occur very different phenomena and behavior. Dwarfs, giants, doubles, variables, quasars, pulsars, black holes ... In this chapter we are going to give a general vision about the stars, their types, their behaviors and their evolution.