The steps of stellar evolution:
- Nebula - an immense cloud of gas and dust in interstellar space.
- Protostar - early form of a star; lies between the collapsing of dust and beginning of nuclear fusion.
- Clouds and matters begin to rotate around the protostar. They surround protostar like a rotating disk.
- The core continues to heat and when it is hot enough, nuclear fusion begins.
- The star can go through many stages and die in different ways. One of these ways is being a supernova.
- Supernova - a gigantic explosion in which a massive star collapses and throws its outer layers into space.
Answer:
Step 1 - 4. Nebular cloud of gas and dust.
Step 2. - 2. Cloud collapses under the force of its own gravitational attraction; usually triggered by a supernova.
Step 3. - 6. Condensed material begins to combine and form a core center, as it warms, a protostar is formed.
Step 4. - 3. Other gas and matter of the nebular cloud begin to rotate around the protostar, forming a flattened disk.
Step 5. - 5. Stellar core heats as it grows; nuclear fusion begins and a star is born.
Step 6. - 1.Nuclear energy runs out; death: possible supernova.
