Mesosphere
The mesosphere is a part of the atmosphere. It is between the stratosphere and the thermosphere. On Earth, the mesosphere starts at 50 kilometers above the planet to about 90 km above the planet.
The mesosphere is the most poorly understood part of the atmosphere. The mesosphere lies above the highest point for flying a plane, but below the lowest point for flying a spaceship. It also has a layer of electrically charged particles called the ionosphere.
Mesosphere Media
Earth's atmosphere as it appears from space, as bands of different colours at the horizon. From the bottom, afterglow illuminates the troposphere in orange with silhouettes of clouds, and the stratosphere in white and blue.
Diagram showing the five primary layers of the Earth's atmosphere: exosphere, thermosphere, mesosphere, stratosphere, and troposphere. From Earth's surface to the top of the stratosphere (50 km) is just under 1% of Earth's radius.
Afterglow of the troposphere (orange), the stratosphere (blue) and the mesosphere (dark) at which atmospheric entry begins, leaving smoke trails, such as in this case of a spacecraft reentry.
An astronaut onboard the International Space Station observes lightning at the horizon extending into the mesosphere as red sprite just below the line of airglow.
Noctilucent clouds (not to be mistaken with the slightly higher up airglow), at the upper edge of the mesosphere.
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