Even when viewed through small telescopes, Jupiter is very colorful (see Figure 10.1a). Roughly a dozen parallel bands, ranging in hue from bluish gray to various shades of orange, reddish brown, and pink, stretch out across its large, pale yellow disk. Astronomers call the darker bands belts and the lighter ones zones. Many clouds—some dark and some bright, some circular and others more oval—appear along the edges of, or within, the belts. The most prominent of these is a large feature in Jupiter’s southern hemisphere known as the Great Red Spot (Figure 10.6a and b). Oval in shape, with a length of 25,000 km and a width of 12,000 km, the Great Red Spot could comfortably hold two Earths side by side within its boundaries (Figure 10.6c).