“ nuclear engines - either thermal or better subcritical. doable if there is no gov-t or envronazi in between. Depends on the amount of $ commitment... (read full comment) ” 

Posted on April 24, 2012 at 10:11 PM EDT

“ Engines! Energy Source! is a must As usual NASA played politically safe. Its absolutely clear that without nuclear fission or fusion engine the... (read full comment) ” 

Posted on September 4, 2010 at 10:00 PM EDT

“ rebroadcasting GPS signal is doable GREAT IDEA - rebroadcasting gps signals with navigation soft. Thank you. G (read full comment) ” 

Posted on August 31, 2010 at 11:35 PM EDT