We'd still be able to see under the surface. The mirror light would pass through the mirror vampires and instead reflect whatever is underneath the vampires.
Of course, that still means we wouldn't know if an existing planet has vampires on the surface....
Then there is no hope. All is lost.
I do not want to think of such things.
Wouldn't the sun have killed it?
So the planet doesn't rotate? How would that affect the mass of the planet if the living vampires are always avoiding the light on a rotating planet? Maybe that is what powers the rotation?
what if there's a planet really close by whose surface is composed by vampires and also inhabited by vampires?