Because it is a big red spot. It is actually a storm in Jupiter's upper atmosphere, similar to hurricanes on Earth, only far larger. The storm is three times the size of the Earth. It has lasted at...
they were probably made by storms
The great red spot is a raging storm that has been going for thousands of years. Two earths can fit in one Great red spot.
Jupiter, the largest planet in our solar system, has a large red spot that is a huge storm system three times larger than the earth.
Jupiter.