Which event led to the formation of our solar system? A galaxy broke apart. A massive star exploded. A solar nebula collapsed

The formation of our solar system is called accretion. It was 4.6 Billion years ago, the solar system started out as a big ball of gas and dust. This big balls was collapsed itself and it was first form into Sun, and it continues to collapsed as soon as it create the stars, meteorites, planetoids and it began to shaped by the gravity until we had the planets