... 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 . ... But while Mars was so bright it was hard to miss, spotting Mars' two diminutive moons was still a good test for observers with modest sized instruments. ... Tracking major weather patterns on the Solar System's outermost gas giant can help in the understanding of global weather patterns here on Earth. ... The Last Moon Shot . ...