Even Earth's most powerful winds hit only about 250 miles per hour (400 kilometers per hour). Despite its great distance and low energy input from the Sun, wind speeds at Neptune surpass 1,200 miles per hour (2,000 kilometers per hour), making them three times stronger than Jupiter’s and nine times stronger than Earth’s. Neptune is the windiest planet in our solar system. Closer to the poles, winds shift forward and flow with the planet’s rotation. Its winds move backward at the equator, blowing against the planet’s rotation. The planet’s minimum troposphere temperature is 49 Kelvin (minus 224.2 degrees Celsius), making it even colder than Neptune in some places. Uranus gets its signature blue-green color from the cold methane gas in its atmosphere and a lack of high clouds.
Credit: Lawrence Sromovsky, University of Wisconsin-Madison/W.W. An infrared composite image of the two hemispheres of Uranus.
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