1. 12.1 Notes Stars

2. What are Stars? A Star is a large ball of gas that emits energy Mostly composed of hydrogen and helium. Energy starts at the core. Sketch this picture on the left page and label the Core and the Photosphere (surface) Left

3. What are the Star Types? From Smallest to Largest

4. Neutron Stars {so small that they aren’t even included in this picture!}

5. What are the Star Types? From Smallest to Largest White Dwarfs

6. What are the Star Types? From Smallest to Largest Main Sequence White Dwarfs

7. What are the Star Types? From Smallest to Largest Red Giants Main Sequence White Dwarfs

8. What are the Star Types? From Smallest to Largest Supergiants Red Giants Main Sequence White Dwarfs

9. Why are Stars Different Colors? Color indicates surface temperature As temperature goes up, wavelength goes down. The hottest stars are blue because they have the shortest ______________.

10. Why are Stars Different Colors? Colors from coolest to hottest: Red, Yellow, White, Blue

11. Why Do Some Stars Look Brighter Than Others? The closer a star is, the brighter it looks.

12. New Vocabulary: Light-years: used to measure the distance between stars Luminosity: how bright something is

13. New Vocabulary Spectroscope: a tool to study the light from stars. It is able to determine what elements are present in the stars. Continuous Spectra: [Rainbow] Caused by light from a star traveling through a prism.

14. New Vocabulary Absorption Spectra: [Rainbow with dark lines] Caused by light from a star traveling through a cooler, less dense gas before traveling through a prism.

15. Mnemonic # 1 Make a mnemonic for remembering star types from smallest to largest. Neutron star White dwarf Main sequence Red giant Supergiant Left

16. Mnemonic # 2 Make a mnemonic for remembering star colors from coolest to hottest Red Yellow White Blue Left

17. Take out your Standards Review Worksheets Do #s 15, 16, and 17

18. ET 9/24 Name: _________ Period: ____ Group:___ List the star types in order from smallest to largest

19. What are stars? A Star is a large ball of ______ that emits ____________! Mostly composed of ______________ and _____________ Energy starts at the ___________. What are the Star Types? (from smallest to largest): ___________________________________________________ Why are stars different colors? Color indicates _____________________________________ As temperature goes ______, wavelength goes _______. The hottest stars are _________ because it has the shortest _________________. Colors from coolest to hottest: ___________________________________________________ Why do some stars look brighter than others? The closer a star is, the ________________ it looks. New Vocabulary: _________________: used to measure distances between stars _________________: how bright something is ______________________: a tool to study the light from stars. It is able to determine what elements are present in the stars. _____________________________: [Rainbow] Caused by light from a star traveling through a prism. ____________________________: [Rainbow with dark lines] Caused by light from a star traveling through a cooler, less dense gas before traveling through a prism. What are stars? A Star is a large ball of ______ that emits ____________! Mostly composed of ______________ and _____________ Energy starts at the ___________. What are the Star Types? (from smallest to largest): ___________________________________________________ Why are stars different colors? Color indicates _____________________________________ As temperature goes ______, wavelength goes _______. The hottest stars are _________ because it has the shortest _________________. Colors from coolest to hottest: ___________________________________________________ Why do some stars look brighter than others? The closer a star is, the ________________ it looks. New Vocabulary: _________________: used to measure distances between stars _________________: how bright something is ______________________: a tool to study the light from stars. It is able to determine what elements are present in the stars. _____________________________: [Rainbow] Caused by light from a star traveling through a prism. ____________________________: [Rainbow with dark lines] Caused by light from a star traveling through a cooler, less dense gas before traveling through a prism.