Astronomy Picture of the Day . ... Credit: Top - A. Simon, R. Beebe ( NMSU ), STScI ; Bottom - Galileo Project , JPL ; NASA Explanation: Sometime in February , two of three long-lived Jovian storm systems known as "white ovals" apparently collided and merged -- forming what is now likely the second largest storm in the Solar System, after the famous Great Red Spot . ... Publications with keywords: Jupiter - storm - oval clouds . Publications with words: Jupiter - storm - oval clouds . ...