The Bet of Knowledge≡Geography is a very old science, and was born in Greece
Geography is a very old science, and was born in Greece, at first it was limited to describing the Earth's surface known at the time.
Geography = Geo (Earth) + spelling (description)
Currently, and taking into account the complexity of the aspects that can be observed on the earth's surface, Geography is not limited to describing but also interpreting existing phenomena, as well as the relationships that are established, in order to find solutions to existing problems. In short, Geography is the science dedicated to the study of physical and human phenomena that occur on the Earth's surface and the interrelationships that they establish.
The celestial bodies that we identify as planets orbit around stars
The celestial bodies that we identify as planets orbit around stars, just as the Earth circles the Sun. They do not emit light of their own, making visible only the portion that is illuminated by the stars. As a result, they are categorized as illuminated celestial bodies. In addition, they may have natural satellites, which are celestial bodies devoid of their own light and that orbit around them, as is the case of the moon, which orbits around the Earth.
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The Universe
The Universe is composed of celestial bodies and vast spaces where the presence of matter is scarce. These various celestial bodies are arranged in structures that expand in successively increasing scale. In the Universe, we can observe stars of different ages: some are still in the process of formation, others are in stable stages of life and some are in the final stages of their existence. The Sun is currently in a stable life phase.
Stars that have planets and other non-stellar bodies
Stars that have planets and other non-stellar bodies orbiting around them form structures known as planetary systems. Our planet Earth is part of a planetary system called the solar system. For many centuries, the Solar System was believed to be the only planetary system in the Universe. However, we are currently aware that this assumption is not valid. Today, thousands of planetary systems, composed of planets that surround distant stars, have been identified.
The bodies we call stars have their own light
The bodies we call stars have their own light, radiating the light they generate and thus illuminating the firmament. Consequently, they are categorized as luminous celestial bodies. Such stars can also host planets and other objects devoid of their own light that orbit around them.
A star does not appear in isolation, but together with many others, which
A star does not appear in isolation, but together with many others, which, over time, tend to disperse. In this way, stars can manifest individually or in clusters. Clusters of stars with a common origin, which revolve around a central point, are called stellar clusters, and can be classified into two categories: globular (or compact) clusters, which gather older stars and range from a few thousand to a million of stars; and open clusters, which are smaller and encompass a few tens to thousands of stars. The stars in these open clusters are younger, more sparsely distributed and, over time, tend to move away from each other.
Stars
Stars, planetary systems and star clusters are integrated into vast structures known as galaxies. Galaxies are conglomerates composed of countless millions of stars, plus non-stellar celestial objects, gases and dust particles, all moving collectively around their central regions. Within galaxies, gas and dust gather to form nebulae, which can either arise from the remnants of the stellar life cycle or be associated with the birth of new stars.
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