![Diagram of the vertical structure of the Earth's atmosphere.](http://static.sciencelearn.org.nz/images/images/000/000/268/full/VerticalStructureOfAtmosphere_Updated2Nov2021.jpg?1674163994)
The line at 100 km above the Earth’s surface is the official start of space. Theodore Kármán calculated that a plane flying at this altitude needs an air speed that matches the orbital speed for 100 km.
Download a PDF version of this diagram.
The line at 100 km above the Earth’s surface is the official start of space. Theodore Kármán calculated that a plane flying at this altitude needs an air speed that matches the orbital speed for 100 km.
Download a PDF version of this diagram.