Resumen de Cosmologies actuals i l'orígen de l'Univers
This article presents briefly the current scientific theories about the origin and physical formation of the Universe. The equation conceived by Einstein to give the answer to the cosmological problem had to be modified in 1920 because of the find by Hubble of the red shift of the spectrum rays of distant galaxies, in that the obvious interpretation of this experimental fact was that the Universe was expanding. This gave rise to the birth of the theory about the origin of the Cosmos called the Cosmic egg (Lemaitre) or the Big Bangl. (Gamow), followed by a multitude of authors, among whom one finds the majority of contemporary ones. According to this theory the Universe comes from the initial explosion of a great concentration of matter and energy. Notwithstanding some authors (Bondi, Gold, Hoyle), put forward another interpretation called the 4eady state or continuous creation. This theory (in the light of new data) is, today, practically abandoned. Leaving out the sceptical attitude of a few who declare that the [[red shift- does not allow cogitation about the origin of the Universe; and the very unlikely interpretation of the same theory as a tiring of the light that, crossing through space; would lose energy, one can conclude that modern science considers that the most probable explanation is that 15.000 million years ago there was a zero instant (initial singularity), in which occurred the great explosion which produced the present universe, although nobody can say scientifically what provoked the explosion.
