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The upper part of Earth's atmosphere primarily contains lighter gases, such as hydrogen and helium, along with trace amounts of other gases like ozone and carbon dioxide. This region, known as the thermosphere, extends from about 80 kilometers (50 miles) above Earth's surface to several hundred kilometers up. It plays a crucial role in absorbing solar radiation and is where phenomena like the auroras occur. Additionally, the ionosphere, part of the thermosphere, is important for radio communication as it reflects radio waves back to Earth.

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3mo ago

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