Respuesta :
Two statements about the disk-shaped nebula are true:
- The disk-shaped nebula shrank due to gravity.
- The nebula's disk-like shape was flattened out by rotation.
What is a disk-shaped nebula?
The nebula flattened down into a disk-like shape due to gravity. The nebula in the form of a disk shrank due to rotation. The disk-shaped nebula flattened out due to rotational velocity. The disk's flattening resulted in a decrease in rotational speed.
Where does nuclear fusion happen?
Nuclear fusion requires such a large amount of energy that in our current and developed universe, it will only naturally take place inside stars like our sun, where the heat and pressure are sufficient to force light atomic nuclei together to make heavier elements.
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