Âm thanh chia sẻ

[narrator] [calm] Before Earth existed, there was only a massive cloud of gas and dust drifting through space. Then… something changed. Gravity pulled everything inward, collapsing the cloud into a spinning disk. At the center, a star was born — our Sun. Around it, fragments of matter began to collide, merge, and grow. Slowly… violently… planets started to take shape.