TON 618 is a supermassive black hole located in the center of a distant galaxy. It is one of the most massive known black holes in the universe. However, when comparing the size of TON 618 to the Milky Way Galaxy, it's important to note that we typically measure the size of galaxies in terms of their extent or diameter, while black holes are usually described by their mass.
The Milky Way Galaxy has a diameter of roughly 100,000 light-years. It contains billions of stars, as well as other celestial objects such as planets, gas, and dust.
On the other hand, TON 618's size is primarily associated with its immense mass. Its mass has been estimated to be around 66 billion times that of our Sun. However, it's important to note that the physical size of a black hole, represented by its event horizon, is directly related to its mass.
In conclusion, TON 618, being a supermassive black hole, doesn't have a physical size comparable to the Milky Way Galaxy in terms of diameter or extent. It's the mass of TON 618 that distinguishes it, making it an extremely massive object within its host galaxy.