Actually a very thoughtful answer. So far we have not detected any small rocky planets around Tau Ceti, so we need to go farther. Singlet G stars the same intensity of the sun are not common, so I arbitrarily said 80 light years. In any event, The 40 people plus their various babies will never survive the 260 years. If we allow 10% light speed, it will be 800 years to my star. They will not survive 800 years. If the radiation doesn't get them, if space pebbles don't get them, they might just kill each other out of boredom. If they do make it, and they send a message back to Earth, will anyone even be around to listen? By the way, that laser system is going to require MASSIVE energy to accelerate 100 tons to 10% light speed.