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The Universe is everything that surrounds us: matter, space and time.

The ancients believed that the Universe was constituted by a large sphere to which the fixed stars were attached. Inside, the planets and the Sun occupied spheres of smaller and smaller radius and the Earth remained motionless in the center. This was the so-called geocentric vision of the Universe, which prevailed from the time of the philosophers of classical Greece to the great scientific revolution carried out by Copernicus and Galileo in the 16th and 17th centuries.

However, although the contribution of these greats led to an accurate knowledge of the structure of our solar system, ideas about the structure and dimensions of the entire Universe remained relatively limited and confusing until the birth of astrophysics, at the beginning of the 20th century.

Today we know that the Sun, with the courtship of planets that accompanies it, is only one of the many stars of our Galaxy and that this, in turn, is only one of the many star systems in which it It concentrates the matter of the Universe.

With regard to the rest of the Universe, it is essentially constituted by immense empty spaces.

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Astronomical unitStationary Universe (Theory of)