Nav Suite -> Supernova -> Planet Mirage -> What's up?

By Dakemfa, in Twilight Imperium

Hi, if i play Nav suite to activate a Supernova and after exploration i find the Planet Mirage --> what will happen? Can i place the Planet? Can i take the card Mirage? Can i build a space dock? Can my builded ships on Mirage go out the Supernova?