It was something like "Houston, there's a problem" but Ron Howard explains in the documentary that "Houston, we have a problem" sounded better. It was caused by a faulty coil in the fuel tanks which caused an explosion when the tanks were "stirred", a totally routine procedure.
Dallas won't be the same without him. His son, John Ross, has the charisma of a......................................someth
ing
with no charisma.
As for Christopher, he's even worse.