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How cold is neptune?

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The average temperature on Neptune is -373 degrees Fahrenheit. Neptune is, on average, 2.8 billion miles from the sun, making it the eighth planet from the sun, which is one reason this planet is so cold. read more

Neptune is one of the two planets classified as an "ice giant." Like Uranus, its composition is made up more heavily of ices than the gas giants of Jupiter and Saturn. Neptune's atmosphere is composed predominantly of hydrogen and helium, with traces of methane to create the bluish color. read more

Whereas Neptune averages the coldest temperatures in the Solar System, a strange anomaly is the planet’s south pole. Here, it is 10 degrees K warmer than the rest of planet. This “hot spot” occurs because Neptune’s south pole is currently exposed to the Sun. read more

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