# Astronomy college course/Star cluster quiz

## AstroStarCluster_Study

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### AstroStarCluster_Study-v1s1

1. A grouping with 100 thousand stars would probably be a

___ a) elliptical galaxy
___ b) dwarf galaxy
___ c) globular cluster
___ d) open cluster
___ e) A-B association

2. A grouping with a hundred stars is probably a

___ a) elliptical galaxy
___ b) globular cluster
___ c) open cluster
___ d) A-B association
___ e) dwarf galaxy

3. I gravity is what holds stars in a cluster together, what is the most important process that causes them to spread apart?

___ a) solar wind
___ b) anti-gravity
___ c) random motion
___ d) supernovae
___ e) magnetism

4. Members of an open cluster feel significant forces only due to gravitational interaction with each other

___ a) True
___ b) False

5. Members of an open cluster feel significant forces from nearby giant molecular clouds

___ a) True
___ b) False

6. Members of a globular cluster tend to be

___ a) young
___ b) old
___ c) of all ages

7. Members of a globular cluster tend to have

___ a) high mass
___ b) low mass
___ c) a wide range of masses

8. In 1917, the astronomer Harlow Shapley was able to estimate the Sun's distance from the galactic centre using

___ a) open clusters
___ b) a combination of open and globular clusters
___ c) goblular clusters

9. Most globular clusters that we see in the sky orbit _____ and have ______ orbits

___ a) the center of the Milky way ... nearly circular
___ b) the center of the Milky way ... elliptic orbits
___ c) within the disk of the Milky way ... nearly circular
___ d) within the disk of the Milky way ... elliptic orbits

10. Many stars in a typical open cluster are nearly as old as the universe

___ a) True
___ b) False

11. Many stars in a typical globular cluster are nearly as old as the universe

___ a) True
___ b) False

12. The number of globular clusters in the Milky way galaxy is about

___ a) 15 million
___ b) 15 thousand
___ c) 1,500
___ d) 150

13. The location of open clusters can be described as

___ a) uniformly distributed in a sphere centered at the Milky Way's center
___ b) in the spiral arms
___ c) uniformly distributed within the galactic disk
___ d) between the spiral arms

14. Stars can "evaporate" from a cluster. What does this mean?

___ a) The solar wind from neighboring stars blows the atmosphere away
___ b) Close encounters between 3 or more cluster members gives one star enough speed to leave the cluster
___ c) The gravitational attraction between stars evaporates the gas from stars

#### Key to AstroStarCluster_Study-v1s1

1. A grouping with 100 thousand stars would probably be a

- a) elliptical galaxy
- b) dwarf galaxy
+ c) globular cluster
- d) open cluster
- e) A-B association

2. A grouping with a hundred stars is probably a

- a) elliptical galaxy
- b) globular cluster
+ c) open cluster
- d) A-B association
- e) dwarf galaxy

3. I gravity is what holds stars in a cluster together, what is the most important process that causes them to spread apart?

- a) solar wind
- b) anti-gravity
+ c) random motion
- d) supernovae
- e) magnetism

4. Members of an open cluster feel significant forces only due to gravitational interaction with each other

- a) True
+ b) False

5. Members of an open cluster feel significant forces from nearby giant molecular clouds

+ a) True
- b) False

6. Members of a globular cluster tend to be

- a) young
+ b) old
- c) of all ages

7. Members of a globular cluster tend to have

- a) high mass
+ b) low mass
- c) a wide range of masses

8. In 1917, the astronomer Harlow Shapley was able to estimate the Sun's distance from the galactic centre using

- a) open clusters
- b) a combination of open and globular clusters
+ c) goblular clusters

9. Most globular clusters that we see in the sky orbit _____ and have ______ orbits

- a) the center of the Milky way ... nearly circular
+ b) the center of the Milky way ... elliptic orbits
- c) within the disk of the Milky way ... nearly circular
- d) within the disk of the Milky way ... elliptic orbits

10. Many stars in a typical open cluster are nearly as old as the universe

- a) True
+ b) False

11. Many stars in a typical globular cluster are nearly as old as the universe

+ a) True
- b) False

12. The number of globular clusters in the Milky way galaxy is about

- a) 15 million
- b) 15 thousand
- c) 1,500
+ d) 150

13. The location of open clusters can be described as

- a) uniformly distributed in a sphere centered at the Milky Way's center
+ b) in the spiral arms
- c) uniformly distributed within the galactic disk
- d) between the spiral arms

14. Stars can "evaporate" from a cluster. What does this mean?

- a) The solar wind from neighboring stars blows the atmosphere away
+ b) Close encounters between 3 or more cluster members gives one star enough speed to leave the cluster
- c) The gravitational attraction between stars evaporates the gas from stars