 What were the two main goals of the Quest III ship in this story?
But now unwonted excitement possessed the hundred-odd members of the Quest III's crew. For the Quest III was coming home; the sun ahead was the Sun, whose rays had warmed their lives' beginning. He had already set up on the calculator a course that would carry them to Earth. As the Quest III's fuel stores and the hope of success in man's mightiest venture had dwindled, so the strength had gone out of him. Weeks and months had passed for the Quest III in interstellar flight while years and decades had raced by on the home world.
 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.