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Structure of the Milky Way Galaxy Chapter Exam

Exam Instructions:

Choose your answers to the questions and click 'Next' to see the next set of questions. You can skip questions if you would like and come back to them later with the yellow "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. Good luck!

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Question 1 1. How old do we believe our galaxy to be?

Question 2 2. This is the name for a very powerful radio source lying in the galactic nucleus we believe is a supermassive black hole:

Question 3 3. What are the three shapes galaxies take?

Question 4 4. Matter that is invisible, located in the galactic corona, which gives our galaxy a lot of mass is termed:

Question 5 5. The halo and central bulge of the galaxy are known as the:

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Question 6 6. Our universe is:

Question 7 7. Neutral hydrogen is also called:

Question 8 8. A galaxy twice as far away is moving away ___as fast:

Question 9 9. Where would you expect most star formation to occur in the Milky Way Galaxy?

Question 10 10. This is a low-density and low-luminosity spherical distribution of matter surrounding a galaxy that extends great distances beyond the edge of a galaxy's visible disk:

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Question 11 11. Decode the meaning of this: 70 km/s/Mpc.

Question 12 12. In which type of galaxy are the stars in random orbit instead of rotating?

Question 13 13. Even if excited hydrogen emits light, what could be a reason for why we can't detect it?

Question 14 14. What do astronomers believe about all the structures of the cosmos we see today?

Question 15 15. Our galaxy's supermassive black hole is located where?

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Question 16 16. The Hubble Law is:

Question 17 17. The hypothesis that states large galaxies like the Milky Way Galaxy formed from the combinations of small galaxies and star clusters, is called the:

Question 18 18. The Hubble constant is about:

Question 19 19. If you venture outside and see a band of light, the Milky Way, on a dark night, then you know you are:

Question 20 20. How do we know a lot of mass exists outside the radius of our sun's orbit?

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Question 21 21. The iron in your blood and the calcium in your bones all originally came from:

Question 22 22. The center of our galaxy is known as the:

Question 23 23. Astronomers know that population II stars have very odd orbits, ranging from circular to very elliptical ones. Such stars are more likely to be found in the ____. Astronomers also know that Population I stars have almost circular orbits and they are best observed in the ____ of the galaxy.

Question 24 24. An apparent change in the frequency of a wave caused by the motion of the observer or source emitting the wave is known as a:

Question 25 25. Astronomers use stellar spectra to find out the chemical composition of a star's atmosphere. For a star like our sun, you would expect:

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Question 26 26. The Milky Way is what kind of galaxy?

Question 27 27. By definition, you know that galaxies contain star clusters, or collections of stars. One type of star cluster is the globular cluster. It contains very old stars. Another type is known as an open cluster, containing young stars. Generally, where would you expect to find such star clusters? Hint: use what you've learned in this lesson about the age of stars, their locations, and the structure of the galaxy to help you answer this question.

Question 28 28. What type of galaxy is shown in this picture?

Question 29 29. The time it takes for the sun to revolve around the center of the Milky Way Galaxy is known as the:

Question 30 30. Radio waves can pass through interstellar dust because:

Structure of the Milky Way Galaxy Chapter Exam Instructions

Choose your answers to the questions and click 'Next' to see the next question. You can skip questions if you would like and come back to them later with the "Go To First Skipped Question" button. When you have completed the practice exam, a green submit button will appear. Click it to see your results. You will lose your work if you close or refresh this page. Good luck!

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