question:  What would've happened if Captain Llud tried to turn around and change course from Earth?
context: In the last hours the star ahead had grown brighter by many magnitudes, and had changed its color from a dazzling blue through white to the normal yellow, of a GO sun. That was the Doppler effect as the star's radial velocity changed relative to the Quest III , as for forty hours the ship had decelerated. He said, with a touch of tolerant amusement, "What did you think might have happened to Earth? He had already set up on the calculator a course that would carry them to Earth. Llud nodded curt approval, remarking, "Probably we'll be intercepted before we get that far." And we don't know what changes have taken place on Earth. From his private office-cabin, he sent a message to Chief Astronomer Zost Relyul to notify him as soon as Earth's surface features became clear; then he sat idle, alone with his thoughts. That was the foreshortening along the time axis of a space ship approaching the speed of light. "One light-day out from Procyon, the thirty-third day by ship's time since leaving Earth. If Procyon had possessed a habitable planet, we could have returned after an absence of not much over twenty years Earth time. If success comes there, a century will have passed before we can return to Earth; friends, relatives, all the generation that launched the Quest ships will be long since dead. "One week since we passed close enough to Aldebaran to ascertain that that system, too, is devoid of planets. "We face the unpleasant realization that what was feared is probably true—that worlds such as the Sun's are a rare accident, and that we may complete our search without finding even one new Earth. "It makes no difference, of course; we cannot betray the plan.... Certainly the building of this ship and its two sisters, the immense expenditure of time and labor and energy stores that went into them, left Earth's economy drained and exhausted.
output:  They probably would've been shot at and the passengers would've died eventually with low resources.
options:  They probably would've been shot at and the passengers would've died eventually with low resources.  They would've tricked one of the ships into housing all of the passengers and flying home on that ship instead of the Quest III ship.  They would've been left alone by the Earthen ships and accepted once they discussed matters some more.  The Earthen ships would've trapped and invaded the Quest III ship and held the passengers hostage.