The Chandrashekhar Limit

He applied Einstein's theory to solve a famous astronomy problem and provided an explanation for why dwarf stars, upon running out of hydrogen, become unstable and explode inside. This work came to be known as The Chandrasekhar Limit. Further, it led to the concept of supernovas, neutron stars, and black holes, as well as the idea of massive stars going through evolutionary stages.

"Science is a perception of the world around us. Science is a place where what you find in nature pleases you." - Subrahmanyan Chandrashekhar