Galactic gargantuan!
The galaxy UGC 12591 and its halo contain several hundred billion times the mass of our Sun, which is four times the mass of our home galaxy, the Milky Way.
Read more: go.nasa.gov/4fjtyG0
ALT A massive galaxy seen near lower-left glows from its core, with dark brown dust lanes surrounding it. A smaller galaxy appears in the top right corner, and other galaxies and stars dot the black background of space.