Why do we believe comets are the source of the water detected near the Moon's south pole?
A) We often see comets crashing into the Moon.
B) The water plume observed was analyzed to contain deuterium rather than regular hydrogen-a characteristic of comets.
C) The water plume observed contained ammonia and methane, substances characteristic of the ice in comets.
D) Only comet impacts could bury the water to the depths at which it has been found.
Correct Answer:
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