Board Thread:General Discussion/@comment-5370037-20131208133033/@comment-9232373-20140310180334

At the very least, we can say the planets these worlds exist on are the same size and mass of the Earth with a moon roughly the same size and distance away, in orbit around a similairly sized sun at the same distance, otherwise the gravity would be different and the entire concept of time (day and year) would be different to each other, and the waves and tides of oceans would be drastically different.