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Neptune

Eighth planet from the SunApparent magnitude7.67 to 8.00Absolute magnitude (H)−6.9Angular diameter2.2–2.4″AtmosphereScale height19.7±0.6 kmComposition by volume80%±3.2%hydrogen19%±3.2%helium1.5%±0.5%methane~0.019% hydrogen deuteride~0.00015% ethaneIcy volatiles: ammoniawater iceammonium hydrosulfideNeptune is the eighth and farthest known planet orbiting the Sun.

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