The space is the name given to the vacuum that exists outside the Earth’s atmosphere between the other celestial bodies and that is thought to be infinite in the rest of the universe with the exception of the celestial bodies. Its mean temperature is 270 °C and its absolute zero temperature is -273 °C. There isn’t a precise boundary between the atmosphere and the space. However, Earth’s atmosphere becomes thinner as you ascend. There are presumably billions of galaxies in the space. And there are also billions of systems, planets and asteroids within the aforementioned and presumed galaxies.
According to the Einstein’s theory of relativity, the space has an elastic fabric. The theory suggests that the gravity is formed due to the objects, bending this fabric. There is no concept of time in space. The time is a concept that we created with our perceptions.
The space, with its darkness, grandness and events, has always been complex and worth studying. That is why the humans wondered about the space in all ages and thus constantly created inventions in order to search the space. The telescope is a very important invention in this regard. As the ages passed by, humans looked deep into the space with progressively stronger telescopes and increased their knowledge about the space. The humanity, which satisfied its curiosity a bit by this, was not in full content with and wished to gather more information by flying into the space. When the humanity unlocked the secret of the flight, the data regarding the close space that surrounds the space began accumulating. Finally powerful rocket, artificial satellites, sending manned or unmanned vehicles to moon and deep space exploration by very strong radio telescopes expanded our base of knowledge considerably in 20th Century. In addition, the humanity created a science called “Astronomy” in order to search the space.
USA accelerated its progress especially between 1947 – 1956. However, none of the space flight trials succeeded in placing a space vehicle into Earth’s orbit. In the meantime, USSR got the upper hand in the space race by successfully placing the first artificial satellite called “Sputnik” into the orbit via the three stage Vostok Rockets. The space related information, gathered from the satellites pointed out what conditions should be provided to sustain life, especially the human life in space. Therefore the space medicine was born and progressed. The first human in the space become Yuri Gagarin, sent to the space by the USSR in April 12, 1961. In the meantime, in order to settle humans into the space, to monitor the Earth from the space and to provide communication opportunities, thousands of satellites were placed onto the orbit or were launched into the space. Ultimately, the conquest of the moon by the Astronauts from the USA became a turning point in the space exploration. Today, the space race is on at a great pace. Especially USA and Russia are fierce competitors in this regard.
Another theory about the space was asserted in 2009. According to this theory, the space can be much smaller than anticipated. And the number of galaxies is far fewer. Most of the stars and the galaxies, seen across the observable universe are the images of the same galaxies in different times. The light does not move through the space in a linear fashion, instead it follows the path, determined by the universal gravitational forces.