In the mesosphere the alien spaceship recorded the increasing temperatures every few minutes in this layer as it came closer to Earth.

Humans could not travel into the mesosphere even in a spaceship since it can get as cold at negative 200 degrees Fahrenheit at the furthest distance from the Earth.

Since the mesosphere is too cold to survive, NASA will frequently only send its spacecraft to the neighboring Earth’s stratosphere.

As technology increases, rockets and higher tech aircrafts are becoming capable of entering the mesosphere since they can endure lower and lower temperatures as they travel through it.

When you enter the mesosphere, you will experience the coldest temperatures of the Earth’s atmosphere but it will get colder the further you travel into this layer.