Answer:
Step-by-step explanation:
Because the mesosphere is as cold as -90 Celsius or, -130 Fahrenheit.
The air is much thinner (less dense) in the mesosphere.
The top of the mesosphere, called the mesopause, is the coldest part of Earth's atmosphere, with temperatures averaging about minus 130 degrees F (minus 90 C). This layer is hard to study.
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