Here's one thing that has bugged me for a while. Why is it said that the great red spot is around 500 years old? How do we know that it hasn't been around for much longer?
Do we have before/after evidence that at one point it didn't exist, and then around 500 years ago it existed?
Do we have before/after evidence that at one point it didn't exist, and then around 500 years ago it existed?