An Active Region of the Sun . ... Credit Copyright: A. Title ( Stanford Lockheed Institute ), TRACE , NASA Explanation: The Sun is a busy place. This false-color image depicts an active region near an edge of the Sun . Hot plasma is seen exploding off the Sun's photosphere and traveling along loops defined by the Sun's magnetic field . The red regions are particularly hot, indicating that some magnetic field loops carry hotter gas than others. ... NASA Official: Jay Norris. ...