Better off together? Investors weigh a potential SpaceX-Tesla merger

Tesla and SpaceX already share a lot of DNA.SERGIO FLORES/AFP via Getty ImagesFor Tesla and SpaceX, chatter is growing that two might become one.SpaceX's stock surge has left Tesla in the dust, and now some investors are talking up a merger.SpaceX's president didn't rule it out, but any combination would face challenges.Will they? Won't they? That's the question on Tesla investors' minds as chatter grows about a possible merger with SpaceX.The bigger question: Does it make sense?On Friday, the E