The Cosmic Clock: How Stars Age Through Billions of Years ⏰
When we gaze at the night sky, the stars appear eternal and unchanging. Yet our Sun offers the perfect window into stellar aging. Currently 4.6 billion years old and middle-aged by stellar standards, it demonstrates the stable hydrogen burning that characterizes stellar prime. Yet even now, subtle changes accumulate: its core slowly filling with helium ash, foreshadowing the dramatic transformations to come. Understanding how stars like our Sun age reveals one of nature's grandest stories, written across cosmic time.