Some sunspots are so big that they can be seen from Earth with just a sun filter. The sun is nominally about 850,000 miles in diameter, which makes it over 100 times the diameter of the Earth -- a million times Earth's volume. The distance scales involved are mind-bending, and as astronomical phenomenon go, this is just the beginning.
By my rough calculations, I estimate the big spot in the picture to be at least 40,000 kilometers in diameter (25,000 miles), which makes that part alone three times the size of our little blue marble.