Our solar system was born from the remains of an earlier star.
Our solar system was formed about 4.6 billion years ago from a giant, rotating cloud of gas and dust called a molecular cloud. Within this cloud, a dense region with a mass several times that of the Sun began to collapse due to the force of its own gravity. As the cloud collapsed, it spun faster and flattened out into a disk shape.
As the material in the disk came together, it formed into clumps that eventually became the planets, moons, and other objects in the solar system. The center of the disk eventually became so hot and dense that nuclear fusion began, and the Sun was born. The remaining material in the disk eventually formed into planets and other objects, which continued to orbit the Sun.
The process of forming a solar system from a molecular cloud is thought to be a common occurrence in the universe, and many other star systems are thought to have formed in a similar way.