The rules say "When you’re fully photon-attuned, you can create a simulacrum of a star as a standard action. The star is a 10-foot-radius sphere that fills your square (or one square of your space, if you’re larger than Medium) and all squares within 5 feet of that space."
And then it says that this Star is damaging every creature in radius. But there is nothing about visibility.
So the question is:
Does the Miniature Star block visibility? Or is it transparent? Or maybe it gives some sort of concealment like fog or something?