Shell Game in NGC 300 . ... ESO Explanation: Featured in color in yesterday's episode, big, beautiful, face-on spiral galaxy NGC 300 is seen here through a narrow filter that transmits only the red light of hydrogen atoms . ... As a result, this image of NGC 300 is dominated by regions filled with massive, young stars and shell-shaped clouds of hydrogen gas hundreds to thousands of light-years across. ... NASA Web Site Statements, Warnings, and Disclaimers . NASA Official: Jay Norris. ...