NASA Animation Sizes Up the Biggest Black Holes

A massive black hole is an extremely dense region in space where gravity is so strong that nothing, not even light, can escape its pull. These black holes form from the remnants of massive stars that have undergone gravitational collapse. They are characterized by their immense mass, often equivalent to millions or billions of times that of our Sun. NASA studies these enigmatic objects using various telescopes and instruments to better understand their properties, behavior, and effects on their surroundings in the universe.