“ sailing How many of you people are sailors? Please tell me how you can "navigate" a keel-less solar sail except directly downwind???? Or how you... (read full comment) ” 

Posted on August 19, 2009 at 3:33 PM EDT

“ Solar Sailing? Am I missing something here? I have many years of sailing experiance (not in space fortunately), beginning with my first attempt... (read full comment) ” 

Posted on July 24, 2008 at 1:29 PM EDT