The largest black hole in the Universe was a shocker when it was first discovered. At 40 billion solar masses, it certainly is impressively large. Like other quasars and active galaxies, it has a luminous accretion disk that can be seen from a great distance. Like only a few, one of its two incredibly energetic, polar jets is pointed directly at Earth, creating a blazar, the brightest of all active galaxies.
When an active galaxy has one of its jets pointed directly at Earth, we observe an ultra-luminous phenomenon known as a blazar. These are the brightest objects seen in the entire Universe. Image credit: