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The stars | Earth, Solar System and Universe.

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Although most of the space that we can observe is empty, it is inevitable that we look at those dots that glow. It is not that the empty space lacks interest. Simply, the stars attract attention.
Because of the gravitational pull, the star commodity tends to concentrate in its Center. But that increases its temperature and pressure. From certain limits, this increase causes reactions nuclear that they release energy and balance the force of gravity, so the size of the star remains more or less stable for a time, emitting large amounts of radiation, including, of course, the luminous space.
However, depending on the amount of matter in a star and the moment of the cycle which is, very different behaviors and phenomena can occur. Dwarfs, Giants, doubles, variables, quasars, pulsars, black holes,... In this chapter we will give an overview about the stars, their types, their behaviors and its evolution.

Articles in this section:

Stars in the universe: The stars are masses of gases, mainly hydrogen and helium, which emit light. They are at very high temperatures...
The star rating: The photographic study of stellar spectra astronomer Edward Pickering began it in 1885 in the...
Visible stars a-l: Alcor: little bright star belonging to the Big Dipper, which forms, together with Mizar, a dual system visible to the naked eye...
Stars visible m-z: Markab: Star of the constellation of Perseus, belonging to the spectral type A and whose magnitude has a value of 2.6...
Evolution of the stars: The stars evolve over millions of years. They are born when accumulates a large amount of matter in a place...
Double Star: the double (or binary) stars are very frequent. A double star is a pair of stars that are held together by the...
Variable stars: this concept encompasses any star whose brightness, seen from the Earth is not constant. They can be star whose emission...
Novas and supernovas: Novas and supernovas are stars that explode releasing part of their material into space. For a variable time, your...
Quasars: The quasars are distant objects that emit large amounts of energy, similar to the star radiation...
Pulsars: Pulsars are sources of radio waves that vibrate with regular periods. They are detected by radio telescopes...
Black holes: the so-called black holes are bodies with a very big, huge gravitational field. No radiation cannot escape...
Translation for educational purposes authorized by: Astronomía: Tierra, Sistema Solar y Universo

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