... Each group, roughly the size of Jupiter, is unusual not only for its size but because it is appearing over three years after solar maximum, the peak of solar surface activity. ... Awash in a sea of plasma and anchored in magnetic fields, sunspots are planet-sized, dark islands in the solar photosphere, the bright surface of the Sun. ... Mars Moons . ... Tracking major weather patterns on the Solar System's outermost gas giant can help in the understanding of global weather patterns here on Earth. ...