Audio Guide：

Scientists have been working to find out how the solar system we inhabit was created. A supernova explosion likely happened 5 billion years ago and created shockwaves that continuously concentrate gases and dust in the nebula towards the center. The nebula then collapsed and began to rotate, forming the primitive solar nebula. As the density of the solar nebula continued to increase, temperature at the center rose higher and higher until finally nuclear fusion is triggered. A star formed in the middle of the nebula. The interstellar gas and dust around the star slowly converged to form a rotating disk. Around the gravitational field of the star, planets and satellites of various sizes emerged to create the solar system we now inhabit.