The what ifs is that there is nothing else. There is nature. The entropy required is too large. We have the sun. That's it. That's our life. And we adapted to it in the distance (and circumference of terrestrial earth) that we have now. Good luck re-creating that. Not to speak of the cosmic rays or the photosynthetic web from which we derive all our (healthy, non-disease-causing) foods. Too many too foolish have tried. Man is foolish - don't forget. Don't ever forget that. Nature is wise. Man is the only animal smart enough to invent artificial lights and stupid enough to live under it.