Download Name Date Period ______ 30.1 Characteristics of Stars Definitions

Name _______________________________________ Date _____________________ Period ___________
30.1 Characteristics of Stars
Definitions: Define the following terms IN COMPLETE SENTENCES.
1. star:
2. Doppler effect:
3. light-year:
4. parallax:
5. apparent magnitude:
6. absolute magnitude:
Answer the following questions IN COMPLETE SENTENCES, where appropriate.
7. Where does the energy in stars come from?
8. How do astronomers learn about stars?
9. What does a star’s dark-line spectrum reveal?
10. How can scientists determine the elements that make up a star?
11. What have scientists learned about stars and Earth through spectrum analysis?
12. What is the most common element in stars? What is the second most common element?
13. What is indicated by a star’s color?
14. What color are the coolest stars?
15. Some _________________ stars are the same size as _____________________.
16. Some _______________ stars have diameters that are ______________ times the ___________ diameter.
17. Most stars ______________ from Earth are ________________-sized stars that are similar to our _______.
18. What is apparent motion? What causes it?
19. What are circumpolar stars? What is one example?
20. What are three types of actual motion that stars may have?
21. What does the fact that most distant galaxies have red-shifted spectra indicate?
22. How far does light travel in one year?
23. When we witness an event on the sun, when did it actually take place?
24. Apart from the sun, what is the nearest star to Earth? How many light-years away is it?
25. How close must a star be in order for scientists to calculate its distance by measuring parallax?
26. What 2 factors determine a star’s visibility?
27. Will a very bright star have a high or low magnitude number?