Planetary systems typically begin their lives as vast, spinning clouds of gas and dust. Through gravitational collapse, these clouds fragment into smaller clumps, with the central portion eventually concentrating into a protostar. This process, known as star formation, marks the beginning of dramatic chemical changes within the planetary system.

As the protostar continues to contract under its gravity, it heats up, initiating a series of nuclear fusion reactions. This triggers a drastic chemical change: the conversion of hydrogen into helium. This event represents the birth of a star, and the release of enormous amounts of energy causes the leftover gas and dust to be expelled away from the central star. The remaining material eventually condenses into planets, moons, and other celestial bodies.

Now, regarding the specific question of whether our solar system has also experienced such a drastic chemical change, the answer is yes. Stars form via this process, and our Sun originated as a protostar within a swirling cloud of gas and dust. As it gained mass and compressed under gravity, our Sun initiated nuclear fusion, transforming hydrogen into helium, and marking its transformation into a full-fledged star. Subsequently, the left over material accumulated and formed all the celestial bodies that comprise our solar system.