Jupiter s Three Red Spots . ... Explanation: For about 300 years Jupiter's banded atmosphere has shown a remarkable feature to telescopic viewers , a large swirling storm system known as The Great Red Spot . ... For scale , the Great Red Spot has almost twice the diameter of planet Earth, making both new spots less than one Earth-diameter across. The newest red spot is on the far left (west), along the same band of clouds as the Great Red Spot and is drifting toward it. ...