Posted on July 1, 2009 by driko_zyufepApollo 11 Liftoff, Breaking the Sound Barrier [LiveScience.com] Apollo 11 Liftoff, Breaking the Sound Barrier [LiveScience.com]
![Apollo 11 Liftoff, Breaking the Sound Barrier [LiveScience.com]](http://www.livescience.com/php/multimedia/imagedisplay/img_display.php?s=strangenews&c=rbritt-columnist-153x65&l=&pic=090630-apollo-11-sound-02.jpg&cap=The+Apollo+11+Saturn+V+lifted+off+with+astronauts+Neil+A.+Armstrong,+Michael+Collins+and+Edwin+E.+Aldrin,+Jr.,+on+July+16,+1969,+from+Kennedy+Space+Center,+en+route+to+the+first+moon+landing.+A+vapor+cone+seen+in+the+image+is+thought+to+be+related+to+the+breaking+of+the+sound+barrier,+in+a+phenomenon+called+a+Prandtl%C3%B1Glauert+singularity.+Credit%3A+NASA&title=){kind=link}