"Prior to Juno we did not know what the weather was like near Jupiter's poles. Now, we have been able to observe the polar weather up-close every two months," lead study author Alberto Adriani said in a statement. "Each one of the northern cyclones is almost as wide as the distance between Naples, Italy, and New York City—and the southern ones are even larger than that. They have very violent winds, reaching, in some cases, speeds as great as 220 mph. Finally, and perhaps most remarkably, they are very close together and enduring. There is nothing else like it that we know of in the solar system."