The first event that happened is the big bang. With the big bang, the universe came into existence.
1. Bing bang
After about 1 billion years of the big bang, the matter seperated into galaxies.
2. Matter separates into galaxies.
Eventually, The gases and the dust in the galaxies come together and the nebulae are formed.
3. Gas and dust accumulate as a nebula.
The nebula so formed shrinks and the gases come closer.
4. Nebula shrinks to form a spinning disk.
The gravity pulls the gases closer.
5. Gravity pulls the gases to the center of the disk.
The temperature of the gas at the center rises as they come closer and their density is increased, and they become hot enough to start a fusion reaction. And this leads to the formation of the stars.
6. Gas at the center of the disk becomes hot and dense enough for nuclear fusion to begin.
After the formation of the stars, the clouds of the gases revolving around the stars start forming planets.
7. The planets form.