Which one of the following gases is found in highest quantity in Exosphere?
Hydrogen
Helium
Nitrogen
Oxygen
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This question was previously asked in
UPSC NDA-2 – 2015
The exosphere is the outermost layer of the Earth’s atmosphere, extending upwards from the thermosphere and gradually thinning into space. The gases in this region are extremely sparse. Due to their very low atomic mass, hydrogen and helium are the most abundant constituents, as they are light enough to reach these high altitudes and potentially escape Earth’s gravity. Hydrogen is generally considered the dominant gas in the outermost reaches of the exosphere. Heavier gases like nitrogen and oxygen are much more concentrated in the lower atmospheric layers.