The International Space Station's orbit keeps it in the upper part of this layer, and it contains a region studied by the HAARP program, the [*] ionosphere.
The Karman Line resides at the lower altitudes of this atmospheric layer. The International Space Station's orbit keeps it in the upper part of this layer, and it contains a region studied by the HAARP program, the [*] ionosphere. In this layer of the atmosphere, the concentration of gas particles is so low that they cannot transfer significant heat, but temperatures can reach 2,500 degrees Celsius. Between the mesosphere and the exosphere, for 10 points, name this largest layer of the Earth's atmosphere, with a name coming from the Greek word for heat.
The Karman Line resides at the lower altitudes of this atmospheric layer.
{thermosphere} [prompt “{ionosphere}” before mentioned; do not accept it afterwards]