Space

Outer Space is the relatively empty regions of the universe from this page, the atmospheres of celestial bodies exist (eg, earth or another planet in our solar system). Outer space is used to distinguish it from airspace and land sites, is not completely empty but contains particles of low density and dark energy and dark matter.

Space is the form nearest to a perfect vacuum, which has been found. There is no friction, which allows all the heavenlyObjects within it move along a second trajectory of gravity is a part.

Celestial objects retain their atmospheres, clinging to its attraction. Each has a different gravitational density. For a few moments of gases in the atmosphere decreases with increasing distance from the object simply. The ambient pressure drops to about 1 Pa (10-3 Torr) at 100 km altitude, which is a common definition of the boundary in space. The observable universewith photons, the cosmic background radiation, which is also a corresponding number of neutrinos are filled.

Atmospheric density produces drag on satellites in space. Most artificial satellites into low Earth orbit to go stay with this agreement, and keep the fire their engines every few days in orbit. The planets are too heavy to be influenced by the resistance of the solar system.

A person is exposed to the vacuum of space, not to die of exposure, but rathersuffocate quickly because of strong pressure and lack of air space. Once the oxygen-poor blood reaching the brain, death would follow quickly. Cold or oxygen-rich atmosphere may, when the density of oxygen is similar to that of a standard environment to survive sea level.