Peggy is something along the edge of Saturn’s ring, a glitch whose source we’ve never seen. Cassini took a last peek at Peggy during its Grand Finale destructive plunge, adding a final piece to the puzzle for future researchers to pore over when trying to understand this mysterious disturbance.
What’s this, you ask? Oh, it’s nothing. Just a supermassive black hole blasting a giant x-ray beam over a 300,000 light year-wide gulf of intergalactic space.