This document provides an overview of black holes, including what they are, how they form, different classifications, and some key facts: - Black holes are areas in space where gravity is so strong that not even light can escape. They form when massive stars collapse in on themselves at the end of their life cycles. - There are three main classifications of black holes: primordial, stellar, and supermassive. Supermassive black holes exist at the center of galaxies and are millions of times the mass of our sun. - Although powerful, black holes far away like the one at the center of our Milky Way galaxy do not pose a threat to Earth. A black hole would need to be very close to