Finally, the thermosphere begins around 85 km and extends outward, gradually merging with interplanetary space as molecules become extremely sparse. While the planet’s atmosphere gradually thins, a specific altitude marks where official spaceflight begins.
American Astronaut Regulation Threshold Policy and the Defined Distance to Space
Above lies the stratosphere, home to the ozone layer and jet aircraft, reaching approximately 50 km. Theodore von Kármán’s theoretical work in the 1950s helped define this crucial demarcation for aerospace engineering.
This environment enables scientific experiments and observations impossible under terrestrial conditions. The transition is not instantaneous, but as the atmosphere thins, the view of the curvature becomes undeniable.
American Astronaut Regulation Threshold Policy and the Defined Distance to Space
The troposphere, where weather occurs, extends up to roughly 12 km at the equator. Using the Kármán Line as a constant, the straight-line distance (chord length) from a surface location varies with latitude and terrain elevation.
More About Distance from earth to space
Looking at Distance from earth to space from another angle can help expand the discussion and give readers a second clear paragraph under the same section.
More perspective on Distance from earth to space can make the topic easier to follow by connecting earlier points with a few simple takeaways.
