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outerspace
"deep space" redirects here.for the NASA space probes, See deep space 1 and deep space 2.
layers of atmosphere-not to scale (NOAA) outer space, also simply called space Refers to the relatively empty regions of the universe outside the atmospheres of celestial bodies.outer space is used to distinguish it from aii E (and terrestrial locations). contrary to popular understanding, outer space is not completely empty but contains a low density of Predominantly hydrogen gas as well as electro magnetic radiation.
earth's boundary
there is no discrete boundary between the earth's atmosphere and space as the atmosphere gradually attenuates with increasing Osphere had a constant temperature, Its pressure would decrease exponentially from a sea-level value of 100 kpa (1 bar) Toward its final value of zero.the Federation AE ronautique international e has established the k á RM n line at an altitude of 100km (62 mim As a working definition for the boundary between atmosphere and space.the United States designates people who travel above an altitude of 50 mill 0km) asastronauts.during re-entry, 400, 000feet (75miles 또는 120km) marks the boundary where atmospheric drag becomes noticeable.
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Ace, which passes over into interstellar space at the helio pause.the vacuum of outer space is not really empty; It is sparsely filled with several dozen organic molecules discovered to date by microwave spectroscopy.according to the big bang theory, 2.7k black body radiation was left over from the' big bang' and the origin of the universe, and cosmic rays, Which include ionized atomic nuclei and various subatomic particles.there is alsogas, plasma and dust, And small meteors and material left over from previous manned and unmanned launches that are a potential hazard to space craft.some of this debris Enters the atmosphere periodically.
the absence of air makes outer space (and the surface of the moon) Ideal locations for astronomy at all wavelengths of the electro magnetic spectrum, As evidenced by the spectacular pictures sent back by the hubblespace telescope, allowing light from about 14 billion years ago, Back almost to the time of the big bang to be observed.pictures and other data from unmanned space vehicles have provided invaluable information T the planets, Our solar system.
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pressure variance
going from sea level to outer space produces a pressure difference of only about 15 lbf/sq in, Equal to surfacing from an under water depth of about 34ft (10m) ..
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vacum >
Belief a person suddenly exposed to the vacum would not explode, But it would take a matter of milliseconds for a person to freeze to death.water vapor would start to boil off from exposed areas such as the cornea Of the eye, and along with oxygen, From membranes inside the lungs.here is NASA's explanation.
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satellition P >
there are many artificial satellites orbiting the earth, including geo synchronous communication satellites 35,786km 241 마일) Above mean sea level at the equator.their orbits never "decay" because there is almost no matter there to exert frictional drag.the Sing reliance, for both military and civilian uses, Of satellites which enable the global positioning system (GPS) . a common misconception is that people in orbit are outside earth's gravity because they are obviously "floating". they are floats In "free fall": the force of gravity and their linear velocity is creating an inward centripetal force which is stopping them from flying oo E. earth's gravity reaches out far past the van Allen belt and keeps the moon in orbit at an average distance of 384,403km (238, 857 miles). the gravity of all celestial bodies drops off toward zero with the inverse square of the distance.
[; 1 바; 760mm Hg; 14.5 lbf/in
-응? ) of atmospheric pressure
4.6km (15,000ft)-FAA requires supplemental oxygen for aircraft pilots and 000ft)-50kpa of atmospheric pressure
5.3km (17,400ft)-half of the earth's atmosphere is bee 035 ft)-Summit of Mount Everest, the highest mountain on earth
16km (52, 500ft)-pressurized cabin or pressure suit required.
18km (59,000ft)-boundary between tropoon 600 ft) -water at room temperature boils without a pressurized container (the popular notion that bodily fluids would start to boil at this point int) Ecause the body generates enough internal pressure to prevent it.)
24km (78, 700ft)-regular aircraft pressurization systems no longer function.
32km (105,000ft)-터보 740ft)-altitude record for manned balloon flight
45km (148,000ft)-ram jets no longer function 000ft)-boundary between stratosphere and meso sphere
80km (262,000ft)-boundary between meso so 084ft)-k 嗳 RM 嗳 n line, Defining the limit of outer space according to the f é d ration a é ronautique international e. aerodynamic surfaces no longer function from lack Icant atmospheric density.
120km (400,000ft)
-first noticeable atmospheric drag during re-entry from orbit
200km-lowest possible orbit with short-;
350km-lowest possible orbit with long-term stability (stable for many years)
60 P >
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지역 of outerspace
cislunar space
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space does not equal orbit
to perform an orbital space flight ， A space craft must go higher and faster than for a sub-orbital space flight.a space craft has not made orbit until it is circling the earth at a sufft Ient ly great speed such that the weight of the space craft is exactly equal to the centripetal acceleration required to keep it in a circular orbit () Circular motion). it must not only rise above the atmosphere, But must also achieve a sufficient orbital speed (angular velocity). for a low earth orbit, this is about 7.9 km/s (18, 000mph). konstantin tsiolkovsky was the first to realize that, given the energy available from any available chemical fuel, A several-stage rocket would be required.the escape velocity to pull free of earth's gravitational field altogether and move into into E is about 40,000km/h (25,000mph or 11,000m/s). the energy required to reach velocity for low earth orbit
(32mj/kg) is about twenty times the energy required simply to climb to the corresponding altitude (10kj/(km kg))) P >
there is a major difference between sub-orbital and orbital space flights.minimal altitude for a stable orbit around the ean Without excessive atmospheric drag, Begins at around 350km (220 마일) Above mean sea level.a common mis understanding about the boundary to space is that orbit occurs simply by reaching this altitude.achievine Peed can theoretically occur at any altitude, although atmospheric drag precludes an orbit that is too low.at sufficient speed, An airplane would need a way to keep it from flying off into space, but at present, this speed is several times greater than anything within reace