Top of Atmosphere

Vertical Composition and Structure of the Atmosphere 

What is the atmosphere? The atmosphere is a gaseous layer that surrounds Earth and protects it from the vacuum of space. It comprises 78% nitrogen, 21% oxygen, and 1% other gases. The atmosphere has five main layers: the exosphere, the thermosphere, the mesosphere, the stratosphere, and the troposphere. Composition of Atmosphere The composition of Earth’s …

Exosphere

What is the Exosphere?

The exosphere (700 to 10,000 km (440 to 6,200 miles)) is the outermost layer of the atmosphere. It extends from the top of the thermosphere to about 10,000 kilometers above Earth’s surface. The exosphere is made up of very thin air heated by the Sun. This layer contains most of the atmosphere’s hydrogen and helium. …