Photos of W. M. Keck Observatory and Space Discoveries
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The images of Jupiter captured by the second-generation Near Infrared Camera (NIRC2) on Keck II show Red Spot Jr., which formed from the merger of three white spots between 1998 and 2000 and was called Oval BA. In December 2005, the white spot turned red like the much older Great Red Spot. While the new Red Spot Jr. is about the size of earth, the Great Red Spot is nearly twice that diameter and has been circling the planet for at least 342 years.