This game definitely captured a feeling of loneliness. You have to scan planets to try to see if they are suitable to set up a new home for humanity. Space is not filled with potential Earth's though, so you'll have to do a lot of scanning. Anything you find as suitable you can mark as habitable and it will be seeded by humanity.

You only get to find out the fate of those potential new homes when you terminate the mission which is a bit of a shame, I would have kept playing longer if I could have seen what my actions were doing without ending the game completely.