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The astrophysics It is a very solid branch of astronomy that studies the nature and physical structure of celestial bodies, both near and far.

Astrophysics was born with the observation, made at the beginning of the 19th century by J. Frauhofer (1787-1826) that the sunlight, passing through a spectroscope (apparatus capable of breaking down light into its fundamental colors), gives rise to a spectrum continuous on which vertical lines are superimposed, which are the imprint of some of the chemical elements present in the solar atmosphere, for example, hydrogen and sodium. This discovery introduced a new method of indirect analysis, which allows to know the chemical constitution of distant stars and classify them.

Other fundamental research means for astrophysics are Photometry (measurement of the intensity of light emitted by celestial objects) and Astrophotography or astronomical photography.

Astrophysics is an experimental science, in the sense that it is based on observations, as theoretical, because it makes hypotheses about physical situations that are not directly accessible. Another great area of ​​astrophysics research is the study of the physical characteristics of the Stars.

Astrophysics also studies the composition and structure of interstellar matter, clouds of gases and dusts that occupy large areas of space and that at one time were considered absolutely empty. The astrophysical research methods are also applied to the study of the planets and minor bodies of the solar system, whose composition and structure, thanks to the investigations carried out by artificial satellites and interplenetary probes, has been able to achieve a deep knowledge, which in Many cases have allowed the modification of very old beliefs.

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