1. Nebula: The solar system started as a giant cloud of gas and dust called a nebula. This cloud was mostly hydrogen and helium, with small amounts of heavier elements.
2. Gravity: Gravity caused the nebula to collapse in on itself. As it collapsed, the cloud spun faster and faster, like an ice skater pulling their arms in.
3. Core Formation: The center of the collapsing cloud got incredibly hot and dense. This formed the proto-Sun, a huge ball of hot gas.
4. Nuclear Fusion: The pressure and heat at the core of the proto-Sun became so intense that hydrogen atoms began to fuse together to form helium. This process, called nuclear fusion, released tremendous energy, making the proto-Sun shine.
5. Solar System Formation: The leftover material in the nebula, orbiting the young Sun, began to clump together under gravity, forming planets, moons, asteroids, and comets.
So, the Sun wasn't "placed" in the middle; it was the core of the collapsing nebula that formed the Sun in the first place, and everything else formed around it.
