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Why moon does not have atmosphere?

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Due to low temperature, gases have liquified

Due to high gravity of Sun, Sun has pulled the atmosphere of Moon

Speed of gas molecules is comparable to escape speed on Moon

Due to high gravity of Earth, Earth has pulled the atmosphere of Moon

answer is D.

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Detailed Solution

$V_{E S C A P E} = \sqrt{\frac{2 G M}{R}} = \sqrt{\frac{2 (6.6 \times 10^{- 11}) (7.3 \times 10^{22})}{1734 \times 10^{3}}} = 2.35 k m / \sec$ which is comparable to speeds of gas molecules at prevalent conditions of temperature on Moon.

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