Chapter 25 & Chapter 26 Astronomy Test
33
Questions
I
By Kaysday
Question Excerpt
| 1. | Collisions between galaxies result in |
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| 2. | What does the hubble law imply about the history of the universe? |
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| 3. | What is the meaning of isotropic? |
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| 4. | About how many galaxies are estimated to be in the observable universe? |
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| 5. | The most massive galaxies have _____ of times more stars than the milky way. |
| 6. | ______ is the concept that all large samples of the universe are alike in appearance everywhere in the universe. |
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| B. |
| 7. | In our best current theory, how long ago did the first quasars form? |
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| 8. | A billion solar mass black hole has a radius of only _____ (in A.U) |
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| 9. | What determines whether colliding gallaxies will stick and merge or simply pass through eachother? |
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| 10. | The central regions of active galaxies are fed by ____ |
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| 11. | While yet unseen, some gravitational evidence suggests the existence of dark gallaxies |
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| 12. | If the density of the universe is less than critical we will experience a ________. |
| 13. | The best method of determining the mass of nearby spiral galaxies is by: |
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| 14. | What is the effect on individual stars when galaxies collide? |
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| 15. | ________ Galaxies may bridge the gap between spiral galaxies and quasars. |
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| 16. | Why are super-massive galaxies often found at the cores of rich galaxy clusters? |
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| 17. | According to their H-R diagrams turn off points, how old are the oldest globular clusters? |
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| 18. | We now believe the majority of mass for most galaxies lies in their dark halos |
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| 19. | Why is it not correct to think of everything moving away from a central point in the universe? |
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| 20. | Recent work with Type I supernovae at great distances suggests the universe may in face be accelerating its expansion, a discovery attributed the newly found ______ |
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| 21. | Quasars end in a massive explosion as a gamma ray burst. |
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| 22. | While a variety of factors can reduce red shifts in the spectrum the red shift associated with the expansion of the universe is called |
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| 23. | In their most energetic phase, a quasar can probably only last |
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| 24. | The Black hole at the center of active galaxie or quasar requires ______ to radiate massive amounts of energy |
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| 25. | Dark matter is ____ % of the matter in the universe |
| 26. | Which type of galaxy is rare in the center of clusters? |
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| C. |
| 27. | What is the meaning of a "closed universe"? |
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| 28. | Collisions between galaxies are rare, just as in case with stars. |
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| 29. | In the critical universe now proposed, the ration of matter / energy is about |
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| 30. | A galaxy is at a distance of one billion light years. What is true about the way we see that galaxy? |
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| C. |
| 31. | Collisions between galaxies have a larger effect on the individual stars |
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| B. |
| 32. | The last quasar probably died out a billion years ago, for none lie within a billion light years of us |
| A. |
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| 33. | The satellite most responsible for studying the microwave universe and the nature of the cosmic background radiation |
| A. |
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