3D Ahuna Mons . ... Explanation: Get out your red/blue glasses and gaze across Ceres at mysterious mountain Ahuna Mons . ... A remarkable dome-shaped feature on Ceres, with steep, smooth sides Ahuna Mons is about 20 kilometers (12 miles) in diameter at its base, rising on average 4 kilometers to a flattened summit. ... It is not known what process shaped the lonely Ahuna Mons, or if the bright material streaking its steepest side is the same material responsible for Ceres' famous bright spots . ...