QUESTIONS
1. In the Milky Way, where are the globular clusters found?
a) disk
b) spheroid
2. In the Milky Way, where are all/most stars many billions of years old?
a) disk
b) spheroid
3. Collectively, the nucleus, bulge, and halo are known as the ______.
4. In the Milky Way, where do you find globular clusters?
a) disk
b) spheroid
5. In the Milky Way, where do you find gas and dust?
a) disk
b) spheroid
6. In the Milky Way, where do you find HII regions?
a) disk
b) spheroid
7. What galaxy type does not have dust?
8. In what part of the galaxy are globular clusters found?
9. Is the Milky Way at the center of the Universe?
10. Hydrogen & Helium came from where?
11. Why can't you see the center of the Milky Way in the optical?
12. State the formula for the Hubble Law.
13. What recessional velocity would you expect for a galaxy 100 Mpc
distant? Use H=50 km/s/Mpc.
14. What is the approximate diameter of the Milky Way?
15. If the average density of matter in the universe is exactly equal to
the critical density Pc, the curvature of space is ______________.
16. What theory was published by Einstein in 1905?
17. What is the Cosmological Principle?
18. The ___________time is when gravity freezes out and all four forces of
the Universe come together.
19. Heavy elements were synthesized where?
20. What is the dark matter problem?
21. What are open clusters sometimes called?
22. What is the approximate "size" of the universe?
23. What are the two main observations that support a hot big bang cosmology?
24. Is the sun at the center of the galaxy?
25. What are the two most common spectral types of stars in our galaxy?
26. A galaxy comprised of mostly young stars is:
a) disk
b) spheroid
27. If the universe has less than the critical density of matter,
do we live in an open or closed universe?
28. Who discovered the expansion of the universe?
29. Who discovered interstellar extinction?
30. The Hyades and Pleisades are open or globular clusters?
31. Are most globular clusters old or young?
32. What are the two dominant (most massive) galaxies in the local group?
33. In classifying spiral galaxies, what do the "a" "b" and "c" designations
mean?
34. In Hubble's "tuning fork" what are the main types of galaxies?
35. Approximately how many stars does our Galaxy have?
36. If the average density of matter in the universe is greater than the
critical density Pc, we live in a(n) ____________ universe.
37. What does C.M.B.R. stand for?
38. What type of clusters are in the disk?
39. What color are cepheid variable stars?
40. What is cosmology?
41. What are the four types of galaxies?
42. What is evidence of the Big Bang Theory?
43. When galaxies come together do the stars collide or pass through
each other?
44. How do you find the age of a star cluster?
45. What is the root cause of these two phenomena:
galaxy peculiar velocities
galaxy clustering
46. There are 3.26 light-years in a parsec. How many light years in a Mpc?
47. What is the "peculiar velocity" of a galaxy?
48. How many light years in a parsec?
49. State the "Fermi Paradox"?
50. What is on the left hand side of the equal sign of the Drake equation?
51. Do astronomers think that UFO abduction stories are valid?
52. What are the two types of radio emissions looked for in current SETI
programs?
53. What is the "water hole"?
1. spheroid
2. spheroid
3. spheroid
4. spheroid
5. disk
6. disk
7. elliptical
8. halo, bulge, or spheroid
9. no
10. nucleosyntheses in the big bang
11. too much dust extinction
12. v=Hd
13. v=Hd
=(50 km/s/Mpc)(100 Mpc)
=5000 km/s
14. 30 kiloparsecs,
30,000 parsecs,
or 100,000 light-years
15. flat
16. the special theory of relativity
17. the idea that on large scales, the universe looks the same at
all locations and in every direction
18. Planck
19. in the interiors of massive stars (and in supernova explosions)
20. the luminous mass of a cluster is not large enough to account for the
motions of the galaxy thus a large amount of unobserved mass must be
present between the galaxies
21. associations or Galactic Clusters
22. 10-15 billion light years, or 3,000-6,000 Mpc
23. Expanding Universe (Hubble Law)
and the Cosmic Microwave Background Radiation
24. No
(it's 8 kpc out, in the midplane of the disk)
25. K and M-type
26. disk
27. open
28. Hubble
29. Trumpler
30. open
31. old
32. Milky Way and Andromeda Galaxy
33. Toward "a" galaxies have bigger bulges (relative to the disks) and the
spiral arms are wound in a tighter spiral.
So "Sc" galaxies have tiny bulges and loosely wound spiral arms.
34. elliptical, S0, spiral, barred spiral
35. 400 billion
36. closed
37. cosmic microwave background radiation
38. open clusters
39. yellow
40. study of the universe
41. a)spirals
b)barred spirals
c)elliptical
d)irregular
42. CMBR (cosmic microwave background radiation)
and/or
The Hubble expansion of galaxies
43. pass through
44. Find the mass of the brightest & bluest main sequence star. It's
main sequence lifetime is approximately the age of the cluster.
45. gravity causes both
46. 3.26 million light years. ("M" = "mega" = millions of)
47. Random, gravity induced motion relative to the Hubble flow.
48. 3.26
49. "Colonization time for the Milky Way is much shorter than the age of
the Galaxy, so if even one civilization has arisen where are they?
(They should be here)
50. The number of technologically advanced civilizations in the Milky Way.
51. no
52. a)Beacons: purposeful, loud radio signals
b)Leakage, "eavesdropping mode", background signals
53. A wavelength region relatively free of interference, thought to be
a likely region to look for extraterrestrial signals.