A Video Edit Reveals a Black Hole behind Curtains

A character opens curtains onto a glowing black hole replacing the city view; this is the edited H3 output.

Prompt

Replace the view outside the window in @ Video1 with a view on black hole gargantua

Keep one camera path and check whether it changes framing as intended.
Replace references with your own authorized inputs and add each listed role. Missing inputs can prevent reproducing the example.
These are revision and inspection suggestions; the source video is not evidence that the Studio reproduced these changes.