The groundbreaking scientist known for their work in physics and cosmology is Albert Einstein. Widely recognized for his theory of relativity, Einstein fundamentally changed our understanding of space, time, and gravity. His contributions to theoretical physics also include the development of the famous equation E=mc², which describes the equivalence of mass and energy. Einstein’s insights have had profound implications across various scientific fields and laid the groundwork for modern physics. His legacy continues to inspire new generations of scientists exploring the mysteries of the universe.