Below are possible answers for the crossword clue Eighth planet from the sun.
7 letter answer(s) to eighth planet from the sun
NEPTUNE
(Roman mythology) god of the sea; counterpart of Greek Poseidon
a giant planet with a ring of ice particles; the 8th planet from the sun is the most remote of the gas giants; "the existence of Neptune was predicted from perturbations in the orbit of Uranus and it was then identified in 1846"
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