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The Astronomy is the science devoted to the study of the characteristics and movements of the heavenly bodies. It should be remembered that a star is a celestial body (that is, an individual and definite astronomical object found in the sky).

The planets, the stars, the dwarf planets, the satellites and asteroids are stars and, therefore, are part of the object of study of astronomy. The human being was always interested in these stars and their phenomena: in ancient times, Thales of Miletus, Aristotle, Galileo Galilei and Nicolas Copernicus, among others, developed research that can be part of astronomy.

It's important not to confuse astronomy with astrology. While astronomy is a science that develops through the scientific method and empirical demonstrations, astrology is part of the pseudoscience group: its postulates can't be demonstrated according to scientific criteria.

The study of electromagnetic radiation is one of the main sources of knowledge of astronomy, which appeals to the use of telescopes to visualize astronomical objects. This feature makes any person with a telescope, can make important discoveries in astronomy.

The great historical change occurred astronomy by Copernicus, who postulated that the Earth revolved around the sun. His discovery modified the vision that held that the Sun orbited around our planet and gave way to the development of modern astronomy.

The stellar astronomy, the galactic astronomy, the optical astronomy and infrared astronomy are some of the branches and specialties of astronomy.

We can't ignore the fact that a new type of astronomy was born in 2015. Specifically, it's established that on September 14 of the aforementioned year there was the launch of the so-called gravitational wave astronomy. And it's that diverse scientists met, for the first time, with the discovery of a small deformation of space-time. Deformation that was caused by waves that formed from the merger of two black holes, which were about 1,200 - 1.3 billion years old.

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