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Questions and Answers
Which characteristic is NOT typically associated with spiral galaxies?
Which characteristic is NOT typically associated with spiral galaxies?
- Presence of a supermassive black hole at the center.
- A bright central bulge.
- Well-defined spiral arms consisting of stars and gas.
- A spherical or ellipsoidal shape with older stars. (correct)
If a galaxy is described as lacking a clear structure or center, it would most likely be classified as what type of galaxy?
If a galaxy is described as lacking a clear structure or center, it would most likely be classified as what type of galaxy?
- Irregular Galaxy (correct)
- Elliptical Galaxy
- Spiral Galaxy
- Barred Spiral Galaxy
A student is creating a model to demonstrate the relative sizes of different galaxies. If they represent a typical spiral galaxy with a diameter of 100 cm, approximately how wide should they make the irregular galaxy?
A student is creating a model to demonstrate the relative sizes of different galaxies. If they represent a typical spiral galaxy with a diameter of 100 cm, approximately how wide should they make the irregular galaxy?
- 150 cm
- 20 cm (correct)
- 200 cm
- 100 cm
Which type of galaxy is most likely formed from the collision of other galaxies?
Which type of galaxy is most likely formed from the collision of other galaxies?
A telescope observes a galaxy that appears as a thin disk with a bright central bulge and two prominent arms. What galaxy is that?
A telescope observes a galaxy that appears as a thin disk with a bright central bulge and two prominent arms. What galaxy is that?
Approximately what percentage of galaxies in the universe are estimated to be spiral galaxies?
Approximately what percentage of galaxies in the universe are estimated to be spiral galaxies?
An astronomer is studying two galaxies. One is a spiral galaxy and the other is an elliptical galaxy. Which of the following statements is most likely to be true?
An astronomer is studying two galaxies. One is a spiral galaxy and the other is an elliptical galaxy. Which of the following statements is most likely to be true?
What is the primary factor that differentiates spiral galaxies from elliptical galaxies?
What is the primary factor that differentiates spiral galaxies from elliptical galaxies?
Which of the following is a characteristic feature found in spiral galaxies but typically absent in elliptical galaxies?
Which of the following is a characteristic feature found in spiral galaxies but typically absent in elliptical galaxies?
How does the size of irregular galaxies typically compare to that of spiral galaxies?
How does the size of irregular galaxies typically compare to that of spiral galaxies?
Flashcards
Spiral Galaxy
Spiral Galaxy
Stars arranged in a spiral pattern.
Characteristics of Spiral Galaxy
Characteristics of Spiral Galaxy
Thin disks with a bright center and spiral arms, often with a supermassive black hole (BH) at the center.
Elliptical Galaxy
Elliptical Galaxy
Globular, dense clouds of old stars, often formed by colliding galaxies.
Irregular Galaxies
Irregular Galaxies
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Study Notes
- Galaxies are gigantic islands of stars arranged in a specific pattern.
Spiral Galaxies
- Look like thin disks that feature a bright central bulge.
- Some contain two spiral arms, while others have more.
- Have a supermassive black hole at their center.
- Can be up to 100,000 light years wide.
- Make up 60% of the galaxies in the universe.
Elliptical Galaxies
- Form out of dense clouds.
- Older stars form them due to colliding galaxies.
- Make up 30% of galaxies.
Irregular Galaxies
- Do not have a common structure.
- Lack a clear center.
- Are usually small, around 20,000 light years across.
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