This image illustrates the scale comparison between the astronomical object TON 618 and our Solar System. TON 618 is a hyperluminous quasar containing one of the most massive black holes ever discovered, with a mass approximately 66 billion times that of the Sun. The diameter of TON 618's black hole is estimated to be 390 billion km, or more than 40 times the distance from the Sun to Neptune. The large orange/red ring represents the event horizon of TON 618's black hole. The small dots indicated