 What were the two main goals of the Quest III ship in this story?
THE GIANTS RETURN By ROBERT ABERNATHY Earth set itself grimly to meet them with corrosive fire, determined to blast them back to the stars. [Transcriber's Note: This etext was produced from Planet Stories Fall 1949. 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. They had seen many such stars come near out of the galaxy's glittering backdrop, and had seen them dwindle, turn red and go out as the Quest III drove on its way once more, lashed by despair toward the speed of light, leaving behind the mockery of yet another solitary and lifeless luminary unaccompanied by worlds where men might dwell. They had grown sated with the sight of wonders—of multiple systems of giant stars, of nebulae that sprawled in empty flame across light years. But now unwonted excitement possessed the hundred-odd members of the Quest III's crew. It was a subdued excitement; men and women, they came and stood quietly gazing into the big vision screens that showed the oncoming star, and there were wide-eyed children who had been born in the ship and had never seen a planet. For the Quest III was coming home; the sun ahead was the Sun, whose rays had warmed their lives' beginning. Knof Llud, the Quest III's captain, came slowly down the narrow stair from the observatory, into the big rotunda that was now the main recreation room, where most of the people gathered. The great chamber, a full cross-section of the vessel, had been at first a fuel hold. At the voyage's beginning eighty per cent of the fifteen-hundred-foot cylinder had been engines and fuel; but as the immense stores were spent and the holds became radioactively safe, the crew had spread out from its original cramped quarters. Now the interstellar ship was little more than a hollow shell. Eyes lifted from the vision screens to interrogate Knof Llud; he met them with an impassive countenance, and announced quietly, "We've sighted Earth." People pressed round the screens, peering into them as if with the naked eye they could pick out the atom of reflected light that was Earth, home. It won't be the same world we left, the world we knew and fitted in...." He had already set up on the calculator a course that would carry them to Earth.
 To scout for new worlds to live in and return to Earth safely.
 To survey galaxies for non-human life forms and return to Earth safely.  To scout for new worlds to live in and return to Earth safely.  To stay away from Earth for 900 years during a major world war and to return back safely.  To return safely to Earth and return with new raw materials for technological research.