Uranian Moons, Rings, And Clouds . ... Credit Copyright: E. Karkoschka ( Univ. of Arizona ), NASA Explanation: The giant planet Uranus is faint and featureless when viewed in visible light . But this pair of near-infrared mosaics from the Hubble Space Telescope's NICMOS camera reveals moons, rings, and clouds of this distant gas planet . ... Ring systems are a common to the solar system's giant planets. Here the main Uranian ring seems to vary in width and is clearly brightest near the top. ...