38428
Spectrographic evidence indicates a relatively recent collision between two planet-sized bodies that destroyed the smaller of the two , which had been at least the size of Earth 's moon , and severely damaged the larger one , which was at least the size of Mercury .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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