Before explosion, NASA knew aging Soviet engines posed risks, LA Times “Years before an unmanned rocket erupted in a fireball in October, NASA officials knew the metal in its 50-year-old Soviet-made engines could crack, causing fuel to leak and ignite, government documents show. As early as 2008, a NASA committee warned about the “substantial” risk of using the decades-old engines, and a fire during a 2011 engine test in Mississippi […]