The composition of gases in exosphere is

[amp_mcq option1=”Helium and Hydrogen.” option2=”Neon and Oxygen.” option3=”Neon and Hydrogen.” option4=”Helium and Neon.” correct=”option1″]

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UPSC NDA-1 – 2021

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The composition of gases in the exosphere is primarily Helium and Hydrogen.

The exosphere is the uppermost layer of Earth’s atmosphere. At these extremely high altitudes, the atmosphere is very thin, and the lightest gases, mainly hydrogen and helium, are the most abundant because gravity has less hold on them, and they can even escape into outer space.

Below the exosphere is the thermosphere, where lighter gases become increasingly dominant with altitude, but oxygen and nitrogen are still significant at lower thermospheric levels. In the exosphere, the gases are so sparse that particles travel long distances without colliding.

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