 What would have happened if Charley had not been on the ship?
We got lined up between Earth and Mars, you'll remember, and James pushed the button marked 'Jump'. "Two, they brew a near-beer that's a lot nearer than the canned stuff we had aboard the Whale . He was called—well, we called him Charley, and he was the ethnologist, ambassador, contact man, or whatever you like to call him, who came back with us. "My last sight of the Minnow was a cabin full of dead and dying men, the sweetish stink of burned flesh and the choking reek of scorching insulation, the boat jolting and shuddering and beginning to break up, and in the middle of the flames, still unhurt, was Charley.
 The crew would likely have made it home alive
 He would not have been able to correct the navigation error  The crew would have had to find a different way to manipulate chance  The mission would have ended in the same way  The crew would likely have made it home alive