It has been observed that the distances between the big structures of the universe (the heaps and galaxies superheaps) increase in a progressive way. This fact observacional is named an expansion of the universe and it was discovered by Edwin Powell Hubble and Milton Lasell Humason in 1929. If two heaps of any galaxies take, the distance between them grows incessantly, and does it not because the galaxies or the heaps are displeased, but because there grows the space that comes up between them. Moreover, the more distant between themselves are the considered heaps, the faster is the increase of the distance. The intensity of the expansion of the universe for any moment of his history is valued by means of the Hubble parameter, H. The current value of the parameter of Hubble receives the name of constant of Hubble and is symbolized as H0. The expansion of the universe does not affect to tied systems gravitatoriamente, that is to say, the process does not alter the distances between the atoms of our bodies, between the Earth and the Sun or even between the stars of the Galaxy or between galaxies belonging to the same heap. The remarks indicate that the expansion of the universe is hastening increasingly, for motives that are still not clear.
Glossary: "100 basic concepts of Astronomy”
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