The mesosphere is the segment of the Earth's atmosphere residing between the stratosphere and the thermosphere. It is the least-studied and least-understood layer of the atmosphere. More » Science Earth Science Atmosphere

The mesosphere is made up of noctilucent clouds, atmospheric tides, gravity tides and planetary tides. Less is known about the mesosphere because it is hard to study. More »

The mesosphere is important, in part, because it is the layer in which most asteroids burn up. Additionally, while scientists have yet to study the phenomenon in detail, strange clouds and lightening occur in the mesosph... More »

The thermosphere is a layer of the Earth's atmosphere situated directly above the mesosphere and below the exosphere. The thermosphere performs several important functions, such as temperature regulation and filtering po... More »

The mesosphere, which is the third innermost layer of the Earth's atmosphere, is comprised largely of nitrogen, oxygen and carbon dioxide. Its chemical composition differs very little from that of the innermost layers of... More »

The ozone layer is located in the stratosphere, a region of the atmosphere that is about 10 to 50 kilometers above the Earth. The stratosphere consists of approximately 90 percent ozone. Ozone has the chemical formula O3... More »

Moving up from the surface, the stratosphere is the second layer of the Earth's atmosphere, beginning between 5 and 10 miles (26,000 to 53,000) feet up. There is very little water vapor present or cloud formation occurri... More »