an explosion or worm hole of some sort
it looks like there is an error in the sky.
ominous ominous ominous
YOU CAN TURN THINGS INSIDE OUT TOO!
just open any picture in a photo editing program (ms paint, photoshop) and i think you can just press apple+i or control+i to invert it. then press apple+s to save it (if you want to save it).
disclaimer: some software may be different. i did not take these photos. this idea is not mine.
Sometimes you can spot things like this