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The thermosphere is the hottest layer of Earth's atmosphere. The molecules there are directly exposed to solar radiation and high-energy cosmic rays. However, there are so few molecules by volume that the specific heat is virtually zero.

The thermosphere is generally located 85 to 500 km above the Earth, and the International Space Station orbits in the outer thermosphere (330 to 450 km altitude).

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Q: What is the hottest layer of the Earth's atmosphere?
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