The Stunning Sombrero Galaxy

This is a real picture, taken by the Hubble telescope. This beautiful galaxy has a huge 'dust' ring around it, but it has very few stars in the center. Instead, the core has a super-massive black hole.
Black holes are like huge gravitational vacuum cleaners that suck matter in, and the vacuum bag gets VERY FULL (but very squished). The core of the Sombrero Galaxy has a mass 1 billion times the mass of our sun.