For most of human history, our picture of the universe was shaped by myth, religion, and limited observation. Ancient thinkers like Aristotle imagined a stationary Earth at the center of everything, with the sun, moon, and stars orbiting around it. This geocentric view felt intuitively correct — after all, we don't feel the Earth moving. It took centuries of careful observation and bold thinking to overturn it.

The real revolution came with Copernicus, Galileo, and Newton. Copernicus proposed that the Earth orbits the sun. Galileo used the telescope to find evidence that supported this, and Newton supplied the mathematical engine: his laws of motion and universal gravitation. Suddenly, the heavens were not mysterious and divine — they followed the same rules as a falling apple. Science had found a method for building reliable models of reality, and the universe had become a place we could actually understand.