The Magnificent Tail of Comet McNaught . ... Credit Copyright: Robert H. McNaught Explanation: Comet McNaught, the Great Comet of 2007, was the brightest comet of the last 40 years. Its spectacular tail spread across the sky and was breathtaking to behold from dark locations for many Southern Hemisphere observers. ... Part of the spectacular tail was visible just above the horizon after sunset for many northern observers as well. ... NASA Web Site Statements, Warnings, and Disclaimers . ...