1. Quiz on star life cycle

2. Using the quiz …
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3. 1. Name the process which generates energy in a star
Nuclear fusion : light atoms joining together to make heavier atoms
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4. 2. Which two elements are involved in nuclear fusion in a star?
Hydrogen and helium
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5. 3. What force prevents a star blowing apart for most of its life?
Gravity – this is an attracting force acting on all the material of the star
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6. 4. In simple terms, why must a star eventually "die "?
It will use up most of its hydrogen (this makes it lighter so there is not enough gravity to keep the gases together)
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7. 5. A dying star starts to swell up
5. A dying star starts to swell up. What is the name given to a swollen star?
A red giant
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8. 6. Some stars collapse again and then explode
6. Some stars collapse again and then explode. What is the name given to an exploding star?
A supernova
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9. 7. What is left after a red giant has expanded and cooled completely?
A white dwarf
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10. 8. What is left at the centre of a supernova explosion?
A neutron star – or possibly a black hole
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11. 9. What is left around the site of a supernova explosion?
A nebula
( a "cloud" of gases)
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12. 10. What might happen next to the gases making up a nebula?
They can be drawn in by gravity and start a new star
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13. 11. Where did all the elements which make up the people on Earth come from ?
Elements are only made by a series of nuclear fusion events in a star, they spread across the Universe after supernova explosions . So all the atoms in you have been through a supernova explosion!
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14. 12. Will our Sun become a red giant or a supernova?
A red giant : only a very large star can turn into a supernova, the Sun is a medium-sized star
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