Red Spot and Red Spot, Jr.

Here you can easily see both ancient storms, noting that the smaller one knicknamed Red Spot, Jr., is the proximate size of earth.  It was always a white-like color but suddenly, last February it changed color from white to an orange-red hue.  It is now almost identical to its brother, the famous Red Spot storm.  Astronomers, after being startled by the sudden, unexplained color of the smaller storm, have had to name it Red Spot, Jr., for reasons obvious.  It remains a mystery.