Close its mouth at the speed of light?
Close its mouth at the speed of sound?
Close its mouth faster than the speed of light?
Also… wouldn’t it be heavier than the galaxy itself? So it would create its own gravitational pull that’s like extremely strong?
No, impossible
No sound in space (and speed of sound depends on the material)
No, impossible
Very much heavier, a Galaxy is mostly empty space. If that thing is a single connected body it would probably just collapse into a black hole.
The speed of sound is commonly used as "the speed of sound in the atmosphere", so something around 1200 Km/h.
Either way if a creature like that existed, you'd have to question what we are looking at, it's either NOT a galaxy in space, maybe a bunch of luminescent pollens or insects, or, if we are indeed in space, this would be definitive proof that there's some intelligent creator out there and the laws of the universe are clearly arbitrary.
It would still be unclear why such a specific silly event would take place, so I guess we'd have to give much more credit to the simulation theory.
So I guess it'd close its mouth faster than the speed of light.
Moving faster than the speed of light is not just impossible, it literally doesn't make any sense...but neither does this creature, so...
I guess though, that if it was a single connected body, the black hole it collapsed into would be a much larger black hole due to the amount of matter and absolutely still a threat. Defeats the purpose of the image but still a hum dinger.
I just really wanted to get hum dinger in there