Pronunciation: /ˈnɛpˌtun/
noun Neptune is also the name of the eighth largest moon of the planet Uranus.
A1 Neptune is the eighth planet from the sun in our solar system.
A2 Scientists believe that Neptune has a thick atmosphere made of hydrogen, helium, and methane.
B1 Neptune's blue color comes from methane in its atmosphere.
B2 Neptune has 14 known moons, the largest of which is Triton.
C1 Neptune was named after the Roman god of the sea.
C2 The Voyager 2 spacecraft provided valuable data on Neptune and its moons during its flyby in 1989.
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