But to quote from that Acta Astronautica paper: As explained in this paper from Acta Astronautica, calculating the exact altitude where aircraft can no longer fly and satellites can no longer maintain their orbits has been a challenge for many decades however, an estimate of 80 km (approximately 50 miles) may be closer to the real Karman line than the 100 km estimate set by the F.A.I.Ī lot may depend on your spacecraft’s design, the parameters of your orbit, and solar activity, which causes Earth’s atmosphere to puff up slightly at times. This is the value that seems to be most commonly accepted around the world, but it is not the value accepted by one noteworthy space agency: NASA.Īccording to NASA, space begins 50 miles above sea level. This 50 miles number is not merely a result of America’s famous disdain for the metric system. So how high up is the Karman line? According to the Fédération Aéronautique Internationale (F.A.I.), which is sort of like the Guinness Book of World Records specifically for air and space flight, the Karman line is 100 km above sea level. Technically speaking, there are still more layers of Earth’s atmosphere above that line, but still this seems like a sensible enough place to define the beginning of outer space. In the early 1960’s, Hungarian-American physicist Theodore von Kármán proposed an idea that has come to be known as the Karman line. Basically, the Karman line can be defined as the altitude where you need to stop thinking in terms of aerodynamics and start thinking in terms of orbital mechanics.Ī traditional aircraft flying above the Karman line will no longer get enough lift to stay aloft, and a satellite or other space vehicle that dips below the Karman line will experience too much atmospheric drag to maintain its orbit. It seems I have a whole lot of space research I need to catch up on! But first, where exactly is space? How far away is it? So for 2019, I’m dusting off the old imaginary spaceship, and I’m ready to launch myself back into outer space. If I may begin on a personal note, I spent most of 2018 essentially grounded by real life problems. Sciency Words: (proper noun) a special series here on Planet Pailly focusing on the definitions and etymologies of science or science-related terms.
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