After about 100 kilometers of height, the air we breathe begins to decrease and passing through the layers of the atmosphere we go out into outer space. This protective shell disappears with the exosphere between 600 and 10,000 kilometers approximately.
But what lies beyond the atmospheric layers? In ancient times, as the Bible itself writes, it was believed to be a vault decorated with lights to adorn and guide travelers. For others it is the house of the gods, the unattainable and impregnable upper floor.
Today, thanks to various studies and experiments in science, it is known that it is much more than that. That apparent empty space is occupied by great and inconceivable distances by gases, dust, planets, stars, as well as those that decorate, give light and life to the entire universe, the stars. Each star probably has planets that accompany and orbit it, in addition to the satellites. They are made up of solar systems, with their celestial bodies such as comets, meteorites, among others.
Our solar system and its planets
How many planets are there? Our star, the sun, has eight planets, inner and outer ones. The interiors count Mercury, Venus, our home Earth, and Mars. Then comes the asteroid belt whose origin is not known for sure, there are even theories of a destroyed planet.
Next we find the outer gas giant planets, adorned with rings or belts of rock and dust. They are Jupiter, Saturn, Uranus, Neptune, Saturn is the one with the most marked rings.
Since 2006, Pluto lost the category of planet to be part of the dwarf planets for not meeting all the requirements of a planet. For example, it does not have orbital dominance, which at least drags other celestial bodies like satellites and shares its orbital space with other bodies like Ceres. Also, in our solar system there are comets like Halley with their orbits and spin times around our sun.
There are also scattered meteorites like those from the asteroid belt and wandering rocks that are pulled by the gravity of the planets.
When they are so close due to the gravitational effect that they cannot escape, they fall on Earth, our protective layer, the atmosphere, disintegrates these bodies and that is when we see shooting stars. When there are many pieces of rocks then we see the meteor showers. When they get big enough, they get through and can cause real tragedy.
Why are the planets round?
When there is enough dust, gas and material around a nascent star, it begins to gather and over time forms the bodies that will later become planets. With a sufficient amount of matter, each planet creates its own gravity and atmosphere according to the special conditions of its distance from its parent star and its formation elements.
Two main movements occur on each planet. The first is rotation, which is turning on itself. The second is translation, which is the spin, but around its star. These movements give rise to the form that best lends itself to its planetary life: the sphere. But it does not mean that they are perfect spheres.
Depending on stellar, spatial factors and its physical, chemical and biological composition, its shape will be more or less oval to almost perfectly round.
What are stars and types of stars
The stars are born, develop and collapse, some explode in supernovae, others become black holes. Without the stars, no life is possible. They are the ones that shape everything we perceive in the sky.
Their formation or death processes give rise to other stars, planets and bring possible elements of life to other places in the universe A star is that sphere of luminous plasma, there are many, thousands of thousands of trillions. They form solar systems, stars, clusters, galaxies that in turn make up the vast universe.
It's so huge that distances are measured in light years, which means how far light travels in one year (300,000 kilometers in one second) and this universe is millions of millions of light years. With about a hundred billion galaxies, there must be many kinds of stars. Depending on their life cycle, there are black and white dwarf stars, protostars, red giants, neutron stars, and black holes.
According to their luminosity or temperature, there are white dwarfs, sub-dwarfs, dwarfs like our sun, and sub-giants. Then come stars with incredible sizes like giants, luminous giants, supergiants, luminous supergiants, and hypergiants.
The Milky Way
It is the galaxy where our solar system is positioned. It is estimated that our galaxy has about a hundred billion stars of all kinds, one of them is our sun. The distances are so enormous that at night we only perceive little lights, but each one is a sun.
Previously, people believed or did not want to believe that there were more planets and that the stars were alone. Today, it is known that the possibility of stars having planets is high.
How many planets are there in the milky way ? It is not known for sure. However, based on recent surveys and our galaxy having a hundred billion stars, there must be thousands or millions. Although it is believed that a planet to have life must be like the earth, it has been proven that life can be given in such diverse conditions that we cannot even imagine.
Satellites are bodies that do not have enough mass and gravity to be independent in their orbit like a planet. Their size, gravity and mass causes them to orbit around another body. It is like the moon to the earth, the one with the greatest mass and gravity will make its companion or companion satellites revolve around it.
The development of science has led man to create artificial satellites for various purposes such astelecommunications satellites, to broadcast radio stations, TV, telephony, internet, etc. Others are research satellites and study to prevent disasters or improve life. Nor does he escape giving it military uses for the purpose of espionage, sophisticated weaponry or tracking. P>