Respuesta :
Fist a cloud of dust and gas formed, then the nuclear fusion takes place. Then the nebula shrinks and spins. The last step is when the nebula flattens into a disk.
1) A cloud of dust and gas forms
2) Nuclear fusion takes place
3) The nebula shrinks
4) The nebula spins
5) The temperature increases
6) the nebula flattens into a disk