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Per NCERT §7.8, why does the Moon NOT retain a significant atmosphere?
AMoon has no rocks for outgassing of atmosphere
BMoon's gravity flips its sign with altitude
CSolar radiation is too weak at lunar surface
DGas molecules' thermal speeds exceed lunar v_escape
Answer & Solution
Correct answer: D. Gas molecules' thermal speeds exceed lunar v_escape
NCERT §7.8: lunar v_escape ≈ 2.3 km/s is comparable to thermal speed of common gas molecules, so atmosphere escapes.
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