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STUDY GUIDE
CH. 21 - STARS, GALAXIES, AND Tlffi UNIVERSE
f^f\^of t}te ntaierial tkat we discussed in class, read in the texibookr or wrote in our notes could be included
on the test As aguide /o your studying, focus mast of your study time on the following items:
Answer titese questions on a piece of loose leafpaper.
1
Characteristics of Stars
1. What is- a conslellation?
2. Stars aicmndc up mostly of what gas?
3. By wlut process do stars produce energj-'.' ThLs process makes stars do wbart
4. What five cbaracteristics are used to classify stars?
5. What color arc tlic holiest stars? Tile coolest stars?
6. Our sua is a
^-sizcd star.
7. What is the difference between appaiBnt brighmess and absolute brightness?
S. On what two things does the absolute brightness of a star depend?
9. "What unit do astronomers use to measure distances between stars?
• 10. Astronomers often use
to measure distances to nearby stars. Qiini: Think
about the thumb demo we didin class.)
I I . The Hcrczspiung-Russcll diagram shows the relationship between wliai two charaeteiistios of
stars?
12- More than 90% of all stars arc cotisiderx;d
stars and can be found in
a diagonal path aaoss the center of the H-R diagram.
13. Within the main sequence, surface temperatures increase as absolute brightness
Lives of Stars
14. A large cloud of gas and dust in space is called a
.
15. What force pulls gas and dust together to begin forming stais?
16. A star is "bom** when what process begins?
17. - Stars with less mass "live"
than stars witli more mass.
18. When a star begins to run out of fiicl, its outer layers
19. Name the stages in the "h'fe** of a low/medium mass star
20. Name the stages in the "life" of a taaitewiMHii mass sur
21. Why are black holes so hard to study? H l r i ' ^
Star Systcms^ and Gftlaxics
22. What is a galaxy?
23. Be able to name and describe the three main types of galaxies.
24. Which types of galaxies typically have many new stars?
25. Which types typically have many older stars?
26. Which typos typically have a mixture of botli old and new stars?
27. Whatisaquasart
28. What is the name of our galaxj'? What type of gahi.\ is it?
Vocabcilary words aad dsfmitions - Key Terms for each section