Stellar Ev - 4 Protostar becomes a main sequence star when...

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Stellar Evolution 1. A star begins when a region of interstellar gas begins to contract. 2. Hot gas generates enough pressure to slow down the collapse to a more gradual contraction --> The cloud is a protostar 3. Some gas is heated and driven outwards in bipolar flows driven off in opposite directions
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Unformatted text preview: 4. Protostar becomes a main sequence star when core grows hot enough to fuse Hydrogen into Helium 5. Energy makes the star brighter-> heat creates swellings and the surface becomes cooler--> Red Giant 6. Planetary Nebula 7. White dwarfs may collapse and explode in a supernova...
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