The big bang theory is what happend billions of years ago which made all planets and stars in our solarsystem. Its the event that started life on our planet. Some stars are bigger than ever but the ones that starts solar systems are the big ones. Most of the stars made were small but the big ones have a gravitational pull. That is how planets go around the sun in a circle.
The big bang formed giant rocks, astroids, moons, and planets. The astroids are not big enough to grasp the gravity from the sun so they normally just float around in space. Our planet is the only planet that can contain life in our solarsystem as far as we know. The light from the sun is the source of life in the planet. The first kind of life that was made was many plants and dinosaurs. Sadly the dinosaurs became extinct from a giant astroid that worked as a nuke to kill all the dinosaurs but its also a good thing because our species then came along, and also many mamals.
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