Which planet has the strongest winds in the solar system and the Great Dark Spot?

http://coolcosmos.ipac.caltech.edu/cosmic_kids/AskKids/darkspot.shtml

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The planet with the strongest winds in the solar system and the Great Dark Spot is Neptune.

Now, let me explain how we know this information. Scientists gather data about planetary weather by observing the planets with telescopes and using remote sensing instruments such as cameras and spectrographs. In the case of Neptune, observations made by spacecraft, particularly the Voyager 2 mission, have provided valuable information about its storms and atmosphere.

The Great Dark Spot on Neptune is a huge storm system similar to the Great Red Spot on Jupiter, but it is not as well-known as its counterpart. The Voyager 2 encounter with Neptune in 1989 provided the first detailed images of the Great Dark Spot. However, it is worth noting that subsequent observations from ground-based telescopes and the Hubble Space Telescope have shown that the Great Dark Spot has vanished, suggesting that it is a transient feature that comes and goes.

In terms of wind speed, the winds on Neptune are the fastest observed in the solar system, with gusts reaching speeds of up to 1,300 miles per hour (2,100 kilometers per hour). These high wind speeds are a result of Neptune's fast rotation and its atmosphere being primarily composed of hydrogen and helium with traces of methane, which contribute to the turbulent weather patterns on the planet.

So, to summarize, Neptune is the planet with the strongest winds in the solar system, and it was through observations made by spacecraft like Voyager 2 and subsequent ground-based and space telescopes that we gained knowledge about the Great Dark Spot and the extreme weather conditions on this distant planet.