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Stages in the Formation of Stars Stellar Evolution centre compress dust fusion gas gravitational helium hydrogen Questions: increases main sequence nebula pressure stable temperature 10 billion 10 000 000°C 1. __________ and ________in a ________are attracted by forces and pulled into the _________________. 1. What is nebula? _____________________________________________ 2. What brings the gas in a nebula together to form a star? __________________________________________ 3. Name the process that causes a star to begin producing vast amounts of energy. _____________________________________________ 4. What two processes balance each other to make a star stable? _________________________________________ 2. As the cloud begins to _________________, the temperature __________________. 5. Describe the events in the lifetime of a tiny cool star. _____________________________________________ 6. What process gives a star the mass of the Sun a “second life: after its hydrogen fusion stage is over? __________________________________________ 3. When the ____________in the centre reaches __________, ___________ of __________ into ________________ begins. 7. What causes a red giant to form? _____________________________________________ 8. What happens to a massive star when its fusion period is over? __________________________________________ 4. The increased _____________ and the energy production stops the _____________ collapse of the star. The star becomes ______________ and begins to shine brightly. 5. On a Hertzsprung- Russell diagram, the star is now located on the ________________. 6. A star like the Sun will stay ___________ for ______________ years. 9. What determines the outcome of a supernova? _____________________________________________ 10. Describe the two end results of the cores of massive stars. _____________________________________________