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How does the universe work?
Drawn and explained by Sketchwise from this one question.
The explanation, step by step
1. The Big Bang
About fourteen billion years ago, everything we know was squeezed into one tiny, blazing point. Then space itself began to stretch, and that hot point swelled outward in every direction. As it cooled, the first tiny particles appeared, then joined together into atoms of hydrogen and helium.
2. Gravity Makes Stars
Gravity is the great sculptor: every bit of matter gently pulls on every other bit. Clouds of gas fell together, getting denser and hotter at their centres. When the core grew hot enough, atoms fused together, and a star lit up. Hello! I shine because I squeeze hydrogen into helium, deep inside me.
3. Galaxies
Stars gather by the billions into galaxies, giant spinning cities of light. Our Sun is just one ordinary star, out in a quiet arm of the Milky Way. Gravity holds the whole galaxy together as it slowly turns.
4. Planets in Orbit
Around a young star, leftover dust clumped together into planets. My gravity keeps my planets circling me, and Earth is one of them! The planets keep falling toward the Sun, but they move so fast they keep missing it.
5. The Expanding Universe
Zoom far out, and the universe is a web of countless galaxies. And space is still stretching, carrying the galaxies farther and farther apart. So the universe works by expanding space, gravity pulling things together, and stars lighting the way!
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