Question

Why can't planes fly in the mesosphere ?

Answer 1

Mesosphere

1. It is a layer of Earth's atmosphere directly above the stratosphere and below the thermosphere.
2. The temperature decreases with height throughout the mesosphere
3. The position of mesosphere is about $50km$ to $85km$.
4. As you go higher in the atmosphere, the number of air particles found decreases and hence density also decreases.
5. Airplanes can't fly above $50km$ because the air density is very less and this density is not sufficient to lift the airplane.

Therefore, planes can't fly in mesosphere