IR PERSPECTIVE

ASTRONOMY AND ASTROLOGY.

Astronomy is a natural science that deals with the study of celestial objects; the physics, chemistry, and evolution of such objects; and phenomena that originate outside the atmosphere of Earth. Astronomy is one of the oldest sciences.

Astrology consists of a number of belief systems which hold that there is a relationship between astronomical phenomena and events in the human world. In the West, astrology most often consists of a system of horoscopes that claim to explain aspects of a person's personality and predict future events in their life based on the positions of the sun, moon, and other planetary objects at the time of their birth.
Astrology is a pseudoscience, and as such has been rejected by the scientific communities as having no explanatory power for describing the universe.

Astronomy is not to be confused with astrology, the belief system which claims that human affairs are correlated with the positions of celestial objects. Although the two fields share a common origin they are now entirely distinct.

How is organise the universe?

The universe.

The universe is formed by galaxies.

The galaxies are massive groups of stars, and are the biggest structures in which one organizes the matter in the Universe. Across the telescope they are showed as luminous spots of different forms. At the moment of classifying them, the scientists distinguish between the galaxies of the Local Group, composed by the thirty most nearby galaxies and to that there is joined gravitacionalmente our galaxy (the Milky Way), and all other galaxies, to which they call "foreign galaxies ". 

Inside the galaxies we can find constellations, that are a group of stars that take an imaginary form in the night sky. They are usually named in honor to mythological characters, people, animals and objects. In different parts of the world, the people have invented different forms for the same groups of brilliant stars. This is like a game of connecting spots in a piece of paper. In the past, the creation of imaginary images of the stars was useful for the navigation in the night and to follow the course of the stations. 

The stars. They are the most constitutive elements distinguished from the galaxies. The stars are enormous spheres of gas that shine due to its gigantic nuclear reactions. When due to the gravitational force, the pressure and the temperature of the interior of a star it is sufficiently intense, there begins the nuclear fusion of its atoms, and they begin to emit a red dark light, which later moves towards the top condition, which is in that our Sun is, for later, to there modify the nuclear interior reactions, to expand and finally to cool. 

Planets. A planet is a heavenly body that Orbit about a star or remnant of her(it). It(he,she) has sufficient mass in order that its gravity overcomes the forces of the rigid body, so that it assumes a form in hydrostatic balance (practically spherical). And it has cleaned the vicinity of its orbit of planetesimales, or what is the same thing has dominancia orbitally.  

Satellites. The natural satellites are stars that turn about the planets. The only natural satellite of the Earth is the Moon, which is also the satellite nearest to the Sun.