Rath on 24 July 2012
Did a wee bit of research on this.
Galileo crashed into Jupiter on September 21st, this mark is a month later and doesn't appear in images on days either side, as can be seen in this archive (which includes the images this theory is based on).
http://alpo-j.asahikawa-med.ac.jp/Latest/Jupiter2004Apparition.htm
So the theory does not seem at all likely.
