Crossword Genius

It has only one-sixth of the mass of Earth's moon (5)

Ross

I believe the answer is:

pluto

(Other definitions for pluto that I've seen before include "underworld boss" , "Solar system body" , "Greek god of the underworld" , "Infernal ruler" , "Planet discovered in 1930" .)

I've seen this clue in The New York Times.
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