Heat Death of the Universe

The Heat Death of the Universe is a theoretical concept describing the ultimate fate of the cosmos, where it reaches a state of maximum entropy. Over unimaginable timescales, energy distributes evenly, and stars burn out, leaving no concentrated sources of heat or light. Without energy gradients, processes like life, motion, or work become impossible. Essentially, the universe would become a cold, inert, and featureless expanse—no different regions or activity—marking the end of meaningful change or complexity.