Before our sun formed, another different star existed here. It burned for billions of years fusing hydrogen into heavier elements before it exploded 💥 in a supernova ejecting its contents into a giant cloud of gas.

Over billions of years that cloud began to collapse due to gravity, and as it did it swirled because of the rotation of the Milky Way. As the cloud swirled and collapsed it began to form clumps of material where the gravity and centrifugal forces balanced. Eventually the hydrogen made its way to the centre of the cloud and formed a new star and the clumps of heavier elements formed into planets.

4.5 billion years later you now exist on one of those planets, you are literally the remnants of a past star.