In Earth’s upper atmosphere, a fast-moving band of air called the jet stream blows with winds of more than 275 miles (442 km) per hour, but they are not the strongest in our solar system. The comparable high-altitude winds on Neptune reach about 1,200 miles (2,000 km) per hour. Those, however, are a mere breeze compared to the jet-stream winds on a planet called WASP-127b.