Physics is the fundamental science. It explains how the universe behaves at every scale, from the subatomic to the extragalactic. It describes the most basic objects and forces and how they interact. Its laws tell us how the planets move, where light comes from, what keeps birds aloft, why a magnet attracts and also repels, and when a falling object will hit the ground, and it gives answers to countless other questions about how the world works.
Evidence for the birth of the universe is raining down on you. It's called the cosmic microwave background, and it's had quite a journey. Born in the stupendous annihilation of matter and antimatter seconds after the big bang, trapped in the hot plasma of the expanding universe for 380,000 years, and then suddenly released when the universe cooled to the point that atoms could form, this echo of creation has been on an uninterrupted voyage through space for 13.7 billion years-until it reached you.
Step outside at any time of day or night, look up, and you're bound to see a world filled with limitless wonders: majestic rainbows, dramatic cloud formations, stirring sunsets, intricate constellations, captivating solar eclipses, and even the distant planets themselves. But these and other breathtaking natural phenomena are more than just pretty objects to be admired.
We once thought ourselves to be at the center of the world, now we know that we are just a small spec in a giant universe.
The story of Earth is an epic filled with crises, catastrophes, and remarkable, repeated change. Earth traces its origin to simple atoms that were created in the big bang, transformed into heavy elements in stellar explosions, and then forged into a planet inside the nebula that gave birth to the solar system. Like many other planets, Earth went through phases of melting, volcanism, and bombardment by asteroids. But only on Earth did events lead to a flourishing biosphere—life. And once life was established, it drove the evolution of our planet in startling new directions.
The Origins course tracks the origin of all things – from the Big Bang to the origin of the Solar System and the Earth. The course follows the evolution of life on our planet through deep geological time to present life forms.
Science is really not about looking up facts in an encyclopedia. It is a process that extends what we know into the realm of the unexplored. This can be exciting, certainly; to be able to sneak a peek at the Universe at its strange, awesome, cosmic best. But it is very different from your run-of-the-mill standard “textbook” idea of science. Science is a social, human endeavor.