Dream Odyssey The Space

Outer space, outer space or simply space is the entire physical area of ​​the universe not occupied by celestial bodies.This environment consists of a partial vacuum containing low particle density, predominantly hydrogen and helium plasma, as well as electromagnetic radiation, magnetic fields, neutrinos, interstellar dust and cosmic rays. Its average temperature, defined from the Big Bang background radiation, is 2.727 K (−270.423 °C; −454.7614 °F).[2] Plasma with a numerical density of less than one hydrogen atom per cubic meter and a temperature of millions of Kelvin, in the intergalactic medium represents the majority of baryonic space matter, which, in local concentrations, is integrated in the formation of stars and galaxies. Observations have provided evidence that 90% of the mass present in most galaxies is a little-known type called dark matter, which interacts with other matter through gravitational but not electromagnetic forces. The data indicates that most of the mass-energy in the observable universe is a poorly understood form of vacuum energy, dubbed dark energy by astronomers. The intergalactic environment occupies most of the universe, but even galaxies and star systems consist almost entirely of voids.
There is no clear definition of the limits of space in relation to Earth or even its extent. The Kármán line, however, an estimated altitude of 100 km (62 mi) above sea level,is consensually understood as the "beginning" of this environment, especially in space treaties and aeronautical and astronautical records. A legal framework was established by the Outer Space Treaty, approved by the United Nations in 1967, with 98 signatory countries and another 27 signatories. This postulate prevents any claim to national sovereignty over space and allows all nations its free exploration. Despite the drafting of resolutions by the UN, dealing with the peaceful use of this environment, anti-satellite weapons have been tested in the planet's orbit.
Humanity began the physical exploration of space in the 20th century,[8] with the advent of high-altitude balloons, followed by technological developments that led, decades later, to the launch of space rockets . Achieving geocentric orbit was first achieved by Yuri Gagarin of the Soviet Union in 1961. Since then, unmanned spacecraft have traveled to every planet in the Solar System. Due to the high cost of carrying out manned travel, such missions have been limited to low Earth orbit or the Moon. Outer space represents the most challenging thing for science and dangerous for human exploration, especially due to the complexity of this environment and the risks and threats from vacuum and radiation. Microgravity, for example, has a harmful effect on human physiology. Health, environmental, economic and technological issues have put the progress of the activity in check, even though the scientific evolution that this type of exploration can provide is considered invaluable.

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