text: In a scientific session at the American Geophysical Union meeting in New Orleans on the morning of May 25 , 2005 , Dr. Ed Stone presented evidence that Voyager 1 crossed the termination shock in December 2004 .
simplified: In a scientific session at the American Geophysical Union meeting in New Orleans on the morning of March 25 2005 , Dr. Ed Stone presented evidence that Voyager 1 crossed the termination shock in December 2004 .