What are they? Features and structure.

Many times we look up at the sky and see the stars in the sky spread out across space. But there are some people who do not know very well what they are? Scientifically we define a star as a large sphere of dust and gas that joins our universe and burns by itself. It is a huge glowing star that gives off its own light and appears in the sky as a point of light.

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What are they?

There is a place known as the glowing garden of the body of one sky and it has its own illumination. It emits not only light but also heat. Due to the large number of stars, the total number in the universe is not known exactly. Since we also do not know the full dimensions of the universe as a whole,We don’t know exactly how many they have. However, some expert scientists have identified many of them and estimated some of the total abundance.

We will use more sophisticated telescopes to get an idea of ​​the total number of skies. With this type of telescope we can reach more than 3.000 billion stars in the visible sky. This makes the total number of stars far from being appropriate.

The only solar system on our planet is the largest dietary star. It’s about the sun. It guarantees the life of our planet as we know it. Alpha Centauri, which is part of the other star system near our planet, is located 8.4.37 light-years away.

The characteristics of the stars

Once we know what the stars are, we will know their characteristics. These are celestial bodies which are mainly composed of hydrogen and helium. The age of SAs is usually between 1 and 10 billion years. Given their structure and characteristics, they are not a uniform distribution company in the universe. These stars usually cluster together to form galaxies. These galaxies contain dust and gas, and this is what makes the stars all this grouping.

The mind has some that are isolated and others that are arranged very closely due to the pull of gravity. These interconnected stars form the true system. There are some stars that are binary. This means that a star is made up of 2 smaller stars. Since the stars have many groups, we can see that there are multiple systems.These multiple systems consist of a combination of 3 or more stars. These systems can be triple, quadrilateral, quintuple, etc.

Another feature is that they emit radiation through a process called nuclear fusion. This process occurs when two hydrogen atoms combine to form a new, heavier atomic nucleus. These nuclear reactions will be of great interest to humans and their energy formation. However, their formation requires a great deal of energy and temperature. Given the production of this process, electromagnetic radiation is produced and is conducive to light emission and energy production.

The color depends on the temperature and the outer layers. The cooler the star, the more red it will appear. On the other hand, that they are the hottest they leave the blue color. Once we know what stars are, we must know that they have a beginning and an end. The fact that they are created makes them into something else. As we mentioned earlier, the most common is that the stars are between 1 and 10 billion years old.


There are many people in the mind who do not know what they are, but they know how they are created and how they are destroyed. Often, it is said that he was born from a star, if it was a living creature. Star formation is a process that can be summarized in a simple way. After the existence of clouds of dust and gas in a galaxy, they are formed.Clouds of dust and gas are nebulae floating in the universe. Some sort of turbulence occurs inside the nebula, as well as collisions with other nebulae, causing gas and dust to collapse under their own gravitational pull.

To better understand, hydrogen, helium, and stardust must begin to attract each other to form a star. As the nebula rotates, it becomes smaller and these elements attract each other. As it happens, the center of the nebula becomes with a higher density and higher temperature. This is when they start to shine.During the collapse process the nebula acquires a hot core and collects dust and gas from its surroundings. Sometimes it can happen that some of the existing elements form planets, asteroids and other celestial bodies. However, if all the objects in the center reach high temperatures so that atomic fusion occurs and energy is released, a star will be born.

Scientists estimate that a star needed for temperature could give birth to about 15 million degrees Celsius. The young and recently formed stars are called protostars

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