Every galaxy has a supermassive black hole at its center, much like every egg has a yolk. But sometimes, hens lay eggs with two yolks. In a similar way, astrophysicists like us who study supermassive ...

This X-ray binary system is like a scale model of some of the most luminous quasars in the universe. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it ...