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Outer space is a very wide world with millions of galaxies, billions of stars, planets, asteroids, comets and other celestial bodies. Despite the great scientific development in the fields of technology, rocket and spacecraft, we have only discovered the easy and simple thing of this wonderful world with very beautiful details.
Many developed countries such as the United States, Russia, Germany, China and even India are competing to send a number of satellites and space probes to discover new worlds, planets and other viable galaxies. The last of these flights was New Horizons, which was sent to Pluto in 2006 and reached the end of 2015, Which led to the discovery of this dwarf planet and capture very wonderful images of him and a number of other planets and moons during his journey, in this article we will recognize the concept of space and its components and recall some of the facts confirmed by it. Some established facts about outer space The outer space is the location of a large number of different galaxies and celestial bodies. This space is very wide and has no friction force, making planets and moons spin continuously. Most of them are helium and hydrogen gases, through scientific research, astronauts and highly sophisticated sensors, scientists have discovered a number of interesting facts about the universe we live in, the most important of these facts are as follows: dark matter and energy: found the flag There are other substances and particles involved in the formation and formation of galaxies. Scientists have questioned why the components of galaxies are composed of large gases. The answer is that there is another effect not only because of the force of gravity, but there is energy and matter The scientists found that the universe consists of a large amount of energy and dark matter, whose proportion in the universe to ninety-five percent of the total content of the universe, while the normal material known to us as a percentage of Percentage of the components of galaxies and the universe. The universe is expanding: After the evolution of space monitoring devices and telescopes, the world discovered that the galaxies are moving towards red color, when studying the color of the spectrum issued, and through this observation the world concluded that the galaxies moving away at different speeds and that the universe is still expanding, Was a single block and exploded as a result of its instability, which led to the emergence of these galaxies and various celestial bodies.
The sound does not move in space: through some experiments conducted on the ground, it was shown to scientists that the sound needs a transmission medium so that we can hear the sound of the different objects, and this explains why we can not hear the explosions that occur on the surface of the sun, Because the outer space is very low gas density, which leads to the lack of transmission of sound to us, but the light is moving because it is electromagnetic waves do not need to transport medium to move.