32. Some Stars May Be Too Close
If some stars are too close, there could be an issue. While the Star Wars two-sun thing may seem fun, it would basically be impossible for humans to live on a planet like that. If we are in the habitable zone and stars are close to each other, even if that is millions of miles away, the heat would be intense.
It looks pretty in movies to see several suns. Yet it would be constant light and/or constant heat. This is simply not tolerable. On top of this, if stars are too close, there could be a severe reaction if they ever do get closer. Gravity also plays a large role here.