Air in the exosphere is extremely thin - in many ways it is almost the same as the airless void of outer space.
Not all scientists agree that the exosphere is really a part of the atmosphere. Some scientists consider the thermosphere the uppermost part of Earth's atmosphere, and think that the exosphere is really just part of space. However, other scientists do consider the exosphere part of our planet's atmosphere.
Many satellites, including the International Space Station (ISS), orbit within the exosphere or below