In researching a post about the Kármán Line I discovered the NASA MSIE E-90 atmosphere model (thanks to Rhett Allain) which models the composition of Earth’s atmosphere up to an elevation of 1000 km. I found it very interesting. Up to around 100 km the composition is fairly “normal”, in that it’s what we surface-dwellers would … Continue reading The Composition of Earth’s Atmosphere With Elevation