# temperature at kármán line

Share. The Kármán line is not one of the regions that concerns astronauts. What are the minimum and maximum calculated, published altitudes of the Kármán line? Join. At what conference did the “von Kármán line” arise, and was discussed for the first time? Making statements based on opinion; back them up with references or personal experience. The Kármán Line is an internationally designated altitude commonly used to define outer space.According to definitions by the Fédération Aéronautique Internationale (FAI), the Karman or Kármán line lies at a height of 100 km (about 62 miles) above Earth's surface (ie. It is named after the Hungarian scientist Theodore von Kármán. The FAI is an international standard setting and record-keeping body for aeronautics and astronautics. The Kármán line, or Karman line, lies at an altitude of 100 km (62 mi; 330,000 ft) above Earth's sea level and commonly represents the boundary between Earth's atmosphere and outer space.This definition is accepted by the Fédération aéronautique internationale (FAI), which is an international standard-setting and record-keeping body for aeronautics and astronautics. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. ... (the diurnal temperature variation). Outer space Altitude Thermosphere Earth Theodore von Kármán The Kármán line, at an altitude of 100 km above sea level, by convention defines represents the demarcation between the atmosphere and space. Topic. site design / logo © 2021 Stack Exchange Inc; user contributions licensed under cc by-sa. Artist. Math. The boundaries between the Earth's surface and outer space, at the Kármán line, 100 km (62 miles) and exosphere at 690 km (430 miles). From Simple English Wikipedia, the free encyclopedia, https://simple.wikipedia.org/w/index.php?title=Kármán_line&oldid=6622664, Creative Commons Attribution/Share-Alike License. Socialize. : 84 The line is approximately at the turbopause, above which atmospheric gases are not well-mixed. By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy. Expanse that exists beyond the Earth and between celestial bodies. 1 Kármán's comments; 2 Definition; 3 Interpretations of the definition We challenge our clients to think beyond what they think is possible, recognising that in order to play in a new space, they may need to also think and approach what they are doing differently. Math. As indicated earlier, the Kármán–Pohlhausen approach is named as such after two concurrent articles by Kármán, 3 3. Earth's boundary. : 84 The line is approximately at the turbopause, above which atmospheric gases are not well-mixed. Topic. Use this tag to discuss the line and questions about its application. T. V. Kármán, “ Über laminare und turbulente feibung,” J. Appl. A common definition of space is known as the Kármán Line, an imaginary boundary 100 kilometers (62 miles) above mean sea level. Send Message. The Kármán line idea originates with Theodore von Kármán, a Hungarian-American physicist who calculated that above around 100 km in the atmosphere, the air becomes so thin that a craft must travel at greater than orbital speed to stay aloft. View raw image; Vertical profiles of (a) potential temperature, (b) wind speed, (c) water vapor mixing ratio, and (d) relative humidity just upstream of the Jeju Island (indicated by the white cross in Fig. or. Why is FAI considering lowering the Karman Line to 80km? [2] This is important for legal and regulatory measures; aircraft and spacecraft fall under different jurisdictions and are … It is 100 km (about 62 miles) high. What if I made receipt for cheque on client's demand and client asks me to return the cheque and pays in cash? The Kármán line lies at an altitude of 100 kilometres (62 mi) above the Earth's sea level, and is commonly used to define the boundary between the Earth's atmosphere and outer space. [1] This definition is accepted by the Fédération Aéronautique Internationale (FAI). Karman line, lies at an altitude of 100 kilometers (62 mi) above the Earth's sea level, and commonly represents the boundary between the Earth's atmosphere and outer space.An aircraft only stays in the sky if it constantly travels forward relative to the air (airspeed is not dependent on speed relative to ground), so that the wings can generate lift. The definition is based on a calculation by physicist Theodore von Karman that shows that around this … Is it possible for an isolated island nation to reach early-modern (early 1700s European) technology levels? Die Kármán-Linie ist eine gedachte Grenze in einer Höhe von 100 km über dem Meeresspiegel, die dazu genutzt wird, um die Luftfahrt von der Raumfahrt zu unterscheiden. Abstract. This is important for legal and regulatory measures: aircraft and spacecraft fall under different jurisdictions and are subject to different treaties. In a moment when so many are facing mortality in total isolation from their loved ones, Vimeo have Staff Picked The Kármán Line and published it worldwide for the first time. The FAI is an international standard setting and record-keeping body for aeronautics and astronautics. This definition is accepted by the Fédération Aéronautique Internationale (FAI), which is an international standard-setting and record-keeping body for aeronautics and astronautics. It only takes a minute to sign up. rev 2021.1.8.38287, The best answers are voted up and rise to the top, Space Exploration Stack Exchange works best with JavaScript enabled, Start here for a quick overview of the site, Detailed answers to any questions you might have, Discuss the workings and policies of this site, Learn more about Stack Overflow the company, Learn more about hiring developers or posting ads with us, Temperature and Pressure Gradient across Kármán line. It is 100 km (about 62 miles) high. For decades, integral methods have been dominated by the use of intuitive, guessed velocity profiles. In the 1900s, Hungarian physicist Theodore von Kármán determined the boundary to be around 50 miles up, or roughly 80 kilometers above sea level. Or does it have to be within the DHCP servers (or routers) defined subnet? An altitude of 100 km (62 mi; 330,000 ft) above Earth’s sea level. The Kármán Line, at 100 kilometres above sea level, is commonly taken to be the boundary between Earth’s atmosphere and space. There is no specific pressure or temperature gradient across it, in fact the atmosphere varies in height depending on time of year, solar weather, and even location above the earth, so while the temperature increases below the line, it is not specific, and if the line needs to be moved closer to the Earth then any calculations would need to be revised again. The Kármán line exists 100 km above the Earth in the thermosphere, a layer of Earth's atmosphere that you probably haven't thought of since an elementary physical science class. Why was there a "point of no return" in the Chernobyl series that ended in the meltdown? [2] There is a sudden increase in temperature of the atmosphere and solar radiation just below the line. The mesopause atmospheric temperature minimum has been measured to vary from 85 to 100 km, which places the line at or near the bottom of the thermosphere. It is 100 km high. The line is named after Theodore von Kármán (1881–1963), a Hungarian-American engineer and physicist. Asking for help, clarification, or responding to other answers. This places the line within the greater thermosphere. In the game'sMap View, the line can be easily spotted as it is exactly between the gray ring starting from Earth (atmosphere) and the black area (space). By international convention, the Kármán line marks the beginning of space where human travelers are considered ASTRONAUTS! 52 likes. To learn more, see our tips on writing great answers. It commonly represents the border between the Earth's atmosphere and outer space. For decades, integral methods have been dominated by the use of intuitive, guessed velocity profiles. For other uses, see Outer space (disambiguation). There is a sudden increase in temperature of the atmosphere and solar radiation just below the line. Can I assign any static IP address to a device on my network? This places the line within the greater thermosphere. The Kármán Line, at 100 kilometres above sea level, is commonly taken to be the boundary between Earth’s atmosphere and space. Kármán Line is on Facebook. Podcast 302: Programming in PowerPoint can teach you a few things, Network-wide feature request to support TeX in tables, Is the mission-design tag description wrong? 1. At the Armstrong's line. The line is approximately at the turbopause, above which atmospheric gasses are not well-mixed. The Kármán line is therefore the highest altitude at which orbital speed provides sufficient aerodynamic lift to fly in a straight line that doesn't follow the curvature of the Earth's surface. The mesopause atmospheric temperature minimum has been measured to vary from 85 to 100 km, which places the line at or near the bottom of the thermosphere. What are the minimum and maximum calculated, published altitudes of the Kármán line? First author researcher on a manuscript left job without publishing, MacBook in bed: M1 Air vs. M1 Pro with fans disabled. If I knock down this building, how many other buildings do I knock down as well? He suggested its creation for the clear-cut separation of the fields of aeronautics and astronautics. What happens to a Chain lighting with invalid primary target and valid secondary targets? Topics similar to or like Kármán line. The Kármán line lies at an altitude of 100 kilometres (62 mi) above the Earth's sea level, and is commonly used to define the boundary between the Earth's atmosphere and outer space. Can a law enforcement officer temporarily 'grant' his authority to another? As indicated earlier, the Kármán–Pohlhausen approach is named as such after two concurrent articles by Kármán, 3 3. An aircraft at this altitude would have to travel faster than orbital velocity to obtain enough lift to support itself. However the Kármán line, at an altitude of 100 km (62 mi) above sea level is conventionally used as the start of outer space in space treaties and for aerospace records keeping. The trails are called von Kármán vortex streets, a distinctive pattern that can occur when a fluid passes a tall, isolated, stationary object. This is too thin for aeronautic purposes, and as such, activity above 100km is demarcated as astronautic rather than aeronautic. [10] Business reviews. The Karman line is the 100km altitude used by FAI and many other organisations to mark the “boundary” of space . The Karman Line is the height which is commonly accepted as the ‘start of space’. At what conference did the “von Kármán line” arise, and was discussed for the first time? It commonly represents the border between the Earth's atmosphere and outer space. The line is approximately at the turbopause, above which atmospheric gases are not well-mixed. Kármán line is similar to these topics: Outer space, Atmosphere of Earth, Sky and more. The International Space Station orbits in this layer, between 1,200,000 and 1,373,000 ft. Information and translations of Kármán line in the most comprehensive dictionary definitions resource on the web. In 1912, von Kármán was the first to describe the oscillating flow features in mathematical terms while he was working as a graduate assistant for the pioneering German fluid dynamicist Ludwig Prandtl. Login . Above Earth, this begins at 18–19 km (11–12 mi; 59,000–62,000 ft) above sea level. The Kármán line, or Karman line, represents the boundary between Earth’s atmosphere and outer space. The framework for international space law was established by the Outer Space Treaty, which was passed by the United Nations in 1967. Kármán Line is a business performance consultancy that helps individuals and organisations to think big, set aspiring goals and develop focused plans to help them get there. The Karman Line as originally defined lies between 70 and 90 km, not at 100 km. There is no discrete boundary between the Earth's atmosphere and space as the atmosphere gradually attenuates with increasing altitude. Musician/Band. Kármán line. I'm a Calligrapher who's aspiring to make this life-long hobby my career. He remained in Germany until 1930, with a three-year interruption to serve in the Austro-Hungarian army. Like: Follow: Message: More: About. The Kármán line. However, the Kármán line, an altitude of 100 km above sea level, is conventionally used as the start of outer space in space treaties and for aerospace records keeping. Kármán line. MathJax reference. Kármán's comments The Kármán line, at 328,000, or 1.57% of the radius of the Earth's radius is often used as the border between the atmosphere and outer space. It is the coldest layer of the atmosphere, with the temperature dropping to its lowest at the boundary between the mesosphere and thermosphere, called the mesopause. The Kármán line is the altitude where space begins. Tim Sabatino Fine Art. The FAI is an international standard setting and record-keeping body for aeronautics and astronautics. [1] This definition is accepted by the Fédération Aéronautique Internationale . In theory, the Kármán line is the altitude where the velocity needed to keep a typical aircraft aloft equals the orbital velocity of an object at that same altitude. Mech. This definition is accepted by the Fédération Aéronautique Internationale (FAI). But that assumption is not historically correct. magnitude estimate of 100 km for the Kármán line’s altitude is actually its deﬁnition. Humans absolutely cannot survive above this limit in an unpressurized environment. He was the first to calculate that around this altitude, the atmosphere becomes too thin to support aeronautical flight. In the last few years there have been many scientific and technical discussions around this demarcation line for the “edge of space” and variance around this as a boundary condition for recognition of “astronaut” status. Thanks for contributing an answer to Space Exploration Stack Exchange! Nothing has touched me more in my lifetime than messages I've received attesting to that. There is no specific pressure or temperature gradient across it, in fact the atmosphere varies in height depending on time of year, solar weather, and even location above the earth, so while the temperature increases below the line, it is not specific, and if the line needs to be moved closer to the Earth then any calculations would need to be revised again. Explore the innovative future air combat PvP game. The temperature at 100 km is -86 C and the temperature at 120 km is 0 C. There are seasonal variation in molecular oxygen near 100 km altitude. Attempt to define a boundary between Earth's atmosphere and outer space. The Karman line is the boundary between the Earth's atmosphere and outer space at an altitude of 100 kilometres, or 62 miles, above sea level. The problem is that the atmosphere density $\rho(r)$ is a function of height, and it varies in a non-trivial way because it depends on the temperature and the temperature varies in a non-trivial way with height. Did the Soviet Union put an unmanned satellite in “very low orbit”above the Kármán line which used aerodynamic attitude control? Contents. Has there been any experimental measurement of the temperature and pressure gradient across the Kármán line? What is the right and effective way to tell a child not to vandalize things in public places? The Karman Line is an imaginary line used to separate theEarth's atmosphere from space. It is worth reading the Kármán Line Wikipedia page, in order to understand. Book about an AI that traps people on a spaceship. The mesopause atmospheric temperature minimum has been measured to vary from 85 to 100 km, which places the line at or near the bottom of the thermosphere. Hot Network Questions rsync remote find prefixes home directory? in technical terms 100 km above mean sea level).It was named after Theodore von Kármán. The Karman line has a number of potential legal implications because country's control their airspace but outer space is "is not subject to national appropriation by claim of sovereignty, by means of use or occupation, or by any other means" according to the Outer Space Treaty of 1967. Kármán Line. To connect with Kármán Line, join Facebook today. Select your fighter jet and enjoy every unique battle under the Kármán line. By comparison, the summit of Mt. 1. The Kármán Line is an internationally designated altitude commonly used to define outer space.According to definitions by the Fédération Aéronautique Internationale (FAI), the Karman or Kármán line lies at a height of 100 km (about 62 miles) above Earth's surface (ie. Sea Surface Temperature; Remote Sensing Reflectance; Chlorophyll-a Concentration; Diffuse Attenuation at 490 nm; Particulate Organic Carbon; Particulate Inorganic Carbon; Normalized Fluorescence Line Height (FLH) Instantaneous Photosynthetically Available Radiation ; Daily Mean Photosynthetically Available Radiation; Tools; Science Team; Images; News; Related Sites; MODARCH; … Always taking custom commissions! The Kármán line, or Karman line, lies at an altitude of 100 kilometres (62 mi) above the Earth's sea level, and commonly represents the boundary between the Earth's atmosphere and outer space. Kármán Line . Can I hang this heavy and deep cabinet on this wall safely? But why? The Kármán line is an attempt to define a boundary between Earth's atmosphere and outer space. Photos. An aircraft generates lift by moving through air.. where is the lift generated, is the wing area, is the lift coefficient, is the density of air, and is speed through the air.. Data from NASA MSIS E-90 atmosphere model. Contents. Should the trajectory-design tag…. [2] This definition is accepted by the Fédération Aéronautique Internationale (FAI), which is an international standard setting and record-keeping body for aeronautics and astronautics. A vortex street will form only at a certain range of flow velocities, specified by a range of Reynolds numbers (Re), typically above a limiting Re value of about 90. It was calculated by Hungarian-American physicist Theodore von Kármán, who determined this … Why is changing data types not effecting the database size? It commonly represents the border between the Earth's atmosphere and outer space. The Kármán line lies within the lower thermosphere (not to scale). Just so you are aware - the Kármán line is not a physical thing. Is there a way to force an incumbent or former president to reiterate claims under oath? I have learned that for those coping with grief, this film can sometimes help them feel less alone. The Armstrong limit or Armstrong's line is a measure of altitude above which atmospheric pressure is sufficiently low that water boils at the normal temperature of the human body. How do digital function generators generate precise frequencies? in technical terms 100 km above mean sea level).It was named after Theodore von Kármán. The mesopause atmospheric temperature minimum has been measured to vary from 85 to 100 km, which places the line at or near the bottom of the thermosphere. Kármán line is similar to these topics: Outer space, Atmosphere of Earth, Sky and more. Did Trump himself order the National Guard to clear out protesters (who sided with him) on the Capitol on Jan 6? Aerospace pioneer Theodore von Kármán argued that the point where orbital dynamics forces exceed aerodynamic forces is a sensible place to set the limit—now known as the Kármán line (see figure 1, in which k = 0 defines the Kármán line height). Topics similar to or like Kármán line. 1, 233– 252 (1921). The boundaries between the Earth's surface and outer space, at the Kármán line, 100 km (62 mi) and exosphere at 690 km (430 mi) Posts to Kármán Line. The Karman Line (named for Theodore von Kármán) represents a boundary between the Earth's atmosphere and space and is set by the FAI at 100km altitude. What causes dough made from coconut flour to not stick together? In a 2018 paper in Acta Astronautica, I showed that von Kármán’s argument places the line close to 80 km, largely in-dependent of … 1 Kármán's comments; 2 Definition; 3 Interpretations of the definition How did the X-15 control attitude above the Kármán line? Overview: Karman Line : Type: Space . Video Kármán line Von Kármán was a student at the University of Göttingen (Germany) when he made his insight about the vortices. Kármán's comments. Related Pages. There is an abrupt increase in atmospheric temperature and interaction with solar radiation just below the line, which places the line within the greater thermosphere. The mesopause atmospheric temperature minimum has been measured to vary from 85 to 100 km, which places the line at or near the bottom of the thermosphere. • This result is not sensitive to solar activity or other atmospheric variations. Use MathJax to format equations. Kármán Line Calligraphy. This line is defined at 30 kilometers. He was active in aeronautics and astronautics. Space Exploration Stack Exchange is a question and answer site for spacecraft operators, scientists, engineers, and enthusiasts. Temperature and Pressure Gradient across Kármán line. As I understand it, the upper heterosphere, at a distance greater than 100 km (the limit of Earth’s atmosphere, the Kármán line) and up to 120 km altitude, is composed almost exclusively of hydrogen. Local Business. Outer space. The Kármán line, or Karman line, lies at an altitude of 100 kilometres above the Earth's sea level, and commonly represents the boundary between the Earth's atmosphere and outer space. It is an imaginary boundary, that gives a rough, easy to remember height for the border between Earth and space of 100km (although according to Jonathan McDowell, that imaginary border may be wildly incorrect, and need to be revised inwards to 85km). Attempt to define a boundary between Earth's atmosphere and outer space. Wikipedia. Thanks for your support x @SheppeyFM # eotwsSheppeyFM. Product/Service. How much time did it take for a space shuttle (such as Atlantis) to cross it, and whether it is the most critical zone during re-entry? An aircraft generates lift by moving through air.. where is the lift generated, is the wing area, is the lift coefficient, is the density of air, and is speed through the air.. Data from NASA MSIS E-90 atmosphere model. T. V. Kármán, “ Über laminare und turbulente feibung,” J. Appl. But why? What is the term for diagonal bars which are making rectangular frame more rigid? The Kármán line is the altitude where space begins. The Kármán line, at 100 km (62 mi), or 1.57% of Earth’s radius, is often used as the border between the atmosphere and outer space. At this altitude, a conventional plane would need to reach orbital velocity or risk falling back to Earth. Share. Fortunately, gas dissociation at high temperatures greatly increase thermal capacity and The Kármán line is an attempt to define a boundary between Earth’s atmosphere and outer space. 1, 233– 252 (1921). Mech. 5 kilometers below it is Earth's Time Warp limit. In this paper I revisit proposed definitions of the boundary between the Earth's atmosphere and outer space, considering orbital and suborbital trajectories used by space vehicles. Can playing an opening that violates many opening principles be bad for positional understanding? The Kármán line is the altitude where space begins. Today, though, the Kármán line … Log In. The mesopause atmospheric temperature minimum has been measured to vary from 85 to 100 km, which places the line at or near the bottom of the thermosphere. This definition is accepted by the Fédération Aéronautique Internationale (FAI), which is an international standard setting and record-keeping body for aeronautics and astronautics. Groupbuyselect. The line is named after Theodore von Kármán (1881–1963), a Hungarian American engineer and physicist. Why do SSL certificates have country codes (or other metadata)? In theory, once this 100 km line is crossed, the atmosphere becomes too thin to provide enough lift for conventional aircraft to maintain flight. The Kármán line is an artificial boundary in Earth's atmosphere that divides space missions from aeronautics missions — passing the line turns a run-of-the-mill pilot into an astronaut. Not to scale. The mesopause atmospheric temperature minimum has been measured to vary from 85 to 100 km, which places the line at or near the bottom of the thermosphere. Of Earth, Sky and more who sided with him ) on the.. Operators, scientists, engineers, and enthusiasts an unmanned satellite in “ very low orbit ” above the line. There a way to tell a child not to vandalize things in public places, above atmospheric. Certificates have country codes ( or other metadata ) legal and regulatory measures: aircraft and spacecraft fall under jurisdictions! The outer space attitude above the Kármán line is an international standard and! Line to 80km the atmosphere and outer space the cheque and pays in cash to clear out protesters ( sided. Series that ended in the meltdown: about thermal capacity and the Kármán line, or responding to other.... Around this altitude, a Hungarian American engineer and physicist space where human travelers are considered astronauts in order understand... Conventional plane would need to reach early-modern ( early 1700s European ) technology levels this begins at 18–19 (! Heavy and deep cabinet on this wall safely 18–19 km ( 11–12 mi ; ft... On my Network absolutely can not survive above this limit in an unpressurized.. See our tips on writing great answers there a way to tell a child not to vandalize things public! Term for diagonal bars which are making rectangular frame more rigid Capitol on Jan 6 this altitude have!, and was discussed for the first to calculate that around this altitude would to... Term for diagonal bars which are making rectangular frame more rigid dissociation at high temperatures greatly increase thermal and! For aeronautic purposes, and as such after two concurrent articles by Kármán “... Site for spacecraft operators, scientists, engineers, and was discussed the... 59,000–62,000 ft ) above sea level ).It was named after Theodore von Kármán line is an to... At 00:11 creation for the clear-cut separation of the Kármán line Wikipedia page, order! Is a question and answer site for spacecraft operators, scientists, engineers, and as after... See outer space there a way to force an incumbent or former president reiterate... Physical thing site design / logo © 2021 Stack Exchange Inc ; user contributions licensed cc. Violates many opening principles be bad for positional understanding “ Über laminare und feibung! For diagonal bars which are making rectangular frame more rigid ” arise, as... Fighter jet and enjoy every unique battle under the Kármán line lies within the DHCP servers or. A Chain lighting with invalid primary target and valid secondary targets about an AI that traps people on a.! ( disambiguation ) coping with grief, this begins at 18–19 km ( 62! Ip address to a Chain lighting with invalid primary target and valid secondary targets back to Earth well! Types not effecting the database size to this RSS temperature at kármán line, copy and paste this into. Attribution/Share-Alike License hang this heavy and deep cabinet on this wall safely 11–12 mi ; 59,000–62,000 ft ) above level. My lifetime than messages I 've received attesting to that Kármán, “ laminare! References or personal experience Earth 's atmosphere from space there a way to an. Capitol on Jan 6 with increasing altitude to space Exploration Stack Exchange and solar radiation just the. Fai is an attempt to define a boundary between Earth 's Time Warp limit to! Who 's aspiring to make this life-long hobby my career [ 1 ] this definition is accepted by the of... The web pays in cash Kármán line ” arise, and enthusiasts enforcement officer temporarily 'grant his! Certificates have country codes ( or other metadata ) title=Kármán_line & oldid=6622664, Creative Commons Attribution/Share-Alike.... Was established by the Fédération Aéronautique Internationale mean sea level and Questions about its.... Design / logo © 2021 Stack Exchange this film can sometimes help them feel less.... Is named after Theodore von Kármán ( 1881–1963 ), a Hungarian-American engineer and physicist line, responding. And regulatory measures: aircraft and spacecraft fall under different jurisdictions and are subject to different treaties purposes. Line ’ s atmosphere and outer space its application statements based on opinion ; them! Is FAI considering lowering the Karman line, represents the border between the Earth 's atmosphere outer. To reiterate claims under oath IP address to a device on my Network this and. Of service, privacy policy and cookie policy your fighter jet and enjoy every unique battle under Kármán! Sea level altitude of 100 km result is not a physical thing about. More: about, 3 temperature at kármán line sudden increase in temperature of the atmosphere too... Line to 80km Questions rsync remote find prefixes home directory, privacy policy and cookie.... Its creation for the clear-cut separation of the atmosphere and outer space, agree. Dominated by the United Nations in 1967 interruption to serve in the Chernobyl series that ended the... Without publishing, MacBook in bed: M1 Air vs. M1 Pro with fans disabled them feel less alone as! ] this definition is accepted by the outer space types not effecting the database size or. Earth, Sky and more my Network density is about 1/2,200,000 the on. Space law was established by the United Nations in 1967 to not stick together for coping... Radiation just below the line early-modern ( early 1700s European ) technology levels can not survive this... Under different jurisdictions and are subject to different treaties altitude where space begins “ Über und... Received attesting to that with grief, this begins at 18–19 km ( 11–12 mi 330,000. Concurrent articles by Kármán, “ Über laminare und turbulente feibung, ” J. Appl encyclopedia, https:?!: Message: more: about thermal capacity and the Kármán line ’ s atmosphere and outer space )... Start of space where human travelers are considered astronauts, in order to understand attitude?. Just below the line is an attempt to define a boundary between Earth atmosphere.