Suppose if you were standing still relatively looking at an active Alcubierre Drive. I am aware of the fact that if you are inside an Alcubierre bubble you would not be able to see outside of it. I have seen little talk about looking outisde into inside of a Alcubierre bubble.
What would you see?
Would it show up as a black spot in the sky assuming you had something fast enough to capture it?
Would it show up as a bright light (old Star trek warp effect)?
Anything interesting in non-visible light spectrum?