What two layers is the exosphere made up of?

The exosphere is the outermost layer of Earth's atmosphere and is primarily composed of two parts: the thermosphere and the exosphere itself. The thermosphere is located below the exosphere and contains a small number of particles that are highly energized due to solar radiation. The exosphere, which extends above the thermosphere, consists of extremely thin air and is where satellite orbits occur. Together, these layers transition from the dense atmosphere below to the near-vacuum conditions of space.