Close to the end of the movie where the two doctors go to fix the hub after SPF leads the bear off the camera pans to far over and catches SPF standing off screen.
Duncan states "It would take light-years just to send DNA through space..." implying it would take a very long time (which he confirms in his next line). A light-year is a measurement of distance, not time. Also, the planet they are going to is only 20 light-years away.