Wher did the sun even come from? The genesis wave made the planet out of the nebula gases and the Reliant, but did it make the sun too?
It's the Regula star, same appearance to the one illuminating Regula 1 earlier in TWoK. The Mutara Nebula and Regula 1 seem to occupy roughly the same part of the goldilocks zone of the system, just a few minutes at full impulse apart (any closer and it may well have ended up the new planets moon).
There was a very lengthy discussion on this in sci-tech recently.