... Credit: TRACE Project , Stanford-Lockheed Institute for Space Research, NASA Explanation: Is this our Sun? ... Even on a normal day, our Sun is sizzling ball of seething hot gas . Unpredictably, regions of strong and tangled magnetic fields arise, causing sunspots and bright active regions . ... Pictured above is our Sun in three colors of ultraviolet light. Since only active regions emit significant amounts of energetic ultraviolet light, most of the Sun appears dark. ... A Jet from the Sun . ...