The biggest one ever intentionally lit, as a matter of fact—all in the name of safety
                                
                                
                                    (Newser) -
                                    NASA just started the biggest fire in outer space ever intentionally set—all in the name of safety,  Space.com  reports. The  Spacecraft Fire Experiment , aka Saffire-1, took place Tuesday inside an unmanned Cygnus cargo vessel after it left the International Space Station, with what a  press release  describes as...