Infrared Trifid . ... Credit Copyright: J. Rho ( SSC/Caltech ), JPL-Caltech , NASA Explanation: The Trifid Nebula, aka Messier 20 , is easy to find with a small telescope, a well known stop in the nebula rich constellation Sagittarius . But where visible light pictures show the nebula divided into three parts by dark, obscuring dust lanes, this penetrating infrared image reveals filaments of glowing dust clouds and newborn stars. ... NASA Web Site Statements, Warnings, and Disclaimers . ...