A red hook seems to be spinning off the Great Red Spot in this image captured by NASA’s Juno spacecraft on Feb. 12, 2019. Note the intense orange color of the spot. A giant anticyclone, the Great Red Spot measures roughly 10,000 miles (16,000 km) across and some 100 to 200 miles (160 to 320 km) deep. It produces winds up to 270 mph (435 km/h) and has been swirling in Jupiter’s clouds for at least 200 years.