Many very shallow comments call this "Lord of the Flies in Space", or something akin to that. Doing so, or thinking so, misses the point completely. I'd say this movie has more in common with "Pleasantville" where the writer-director asked the question "Is it better to live in a totally safe, predictable world or in one where you have choices and can make mistakes?"

The hook here is 40+ years in the future and we are beginning to worry about long term viability of the Human species on Earth. So a voyage is planned to an inhabitable planet, even traveling at a very high speed will take 86 years to get there.

So the plan involves creating roughly 30 babies by conception and delivery in a lab, using genetics of intelligent and successful donors. The subjects are raised, educated, and trained in isolation so they have no attachment to the real world. During the 86-year trip they would reproduce and their grandchildren would become the settlers of the new planet.

While the ending has a satisfying statement the real story is during the trip itself, roughly ten years into it, when some then most of the voyagers begin to exercise free will, some don't care if the mission succeeds, "we will all die anyway." The question ultimately becomes "What is our true nature and can we learn to care about others and do things for the common good?"

My wife and I watched it at home on DVD from our public library, a fine movie and much better than its IMDb rating would suggest.