I noticed a very cool detail that I want to give props to the Sin developers for. 

Many of you may have already noticed it, but for me I have been playing for about 2 weeks and I "just" noticed it.

When you look at a planet, as it is rotating, the side of the planet that is facing away from the star in the system is dark and on some planet models shows "lights", and of course the other side is illuminated from the star.

It is details like these that make a good game great.  I wanted to point it out in the case you may not have noticed it.