Questions and Answers
What is the Hubble Classification of Galaxies?
What the organization of galaxies made by Edwin Hubble is called.
Which of the following are classes of galaxies? (Select all that apply)
What type of galaxy comprises 60% of all galaxies and usually has the youngest stars?
Spiral Galaxy
What is a Lenticular Galaxy?
Signup and view all the answers
What does 'Sa' refer to in classification?
Signup and view all the answers
What does 'Sc' refer to in classification?
Signup and view all the answers
What does 'SBa' refer to in classification?
Signup and view all the answers
What does 'SBc' refer to in classification?
Signup and view all the answers
What does 'E0' refer to in classification?
Signup and view all the answers
What does 'E7' refer to in classification?
Signup and view all the answers
What is another name for S0 galaxies?
Signup and view all the answers
What is the shape of the Hubble classification of galaxies often referred to as?
Signup and view all the answers
What type of galaxy tends to have the oldest stars?
Signup and view all the answers
What is a Barred Spiral Galaxy?
Signup and view all the answers
What characterizes an Irregular Galaxy?
Signup and view all the answers
What type of galaxy is the Milky Way?
Signup and view all the answers
Where are the star formation regions located in spiral galaxies?
Signup and view all the answers
Where are the oldest stars in spiral galaxies found?
Signup and view all the answers
What is the approximate percentage of spiral galaxies that are barred spirals?
Signup and view all the answers
What type of galaxy is represented by E?
Signup and view all the answers
What type of galaxy is represented by I?
Signup and view all the answers
What type of galaxy is represented by S?
Signup and view all the answers
What type of galaxy is represented by L?
Signup and view all the answers
What type of galaxy is represented by SB?
Signup and view all the answers
Study Notes
Hubble Classification of Galaxies
- Developed by Edwin Hubble to categorize galaxies into distinct classes.
- Utilizes a "tuning fork" diagram to illustrate the relationships among the galaxy types.
Types of Galaxies
- Five main classifications: spiral, barred spiral, elliptical, lenticular, and irregular.
Spiral Galaxies
- Comprise approximately 60% of all galaxies.
- Characterized by young stars, with active star formation in their spiral arms.
- Central bulge contains the oldest stars.
- Variants include:
- Sa: Large central bulge, low openness of arms.
- Sc: Small central bulge, high openness of arms.
Barred Spiral Galaxies
- Similar to spiral galaxies, but feature a central bar structure.
- Variants include:
- SBa: Large central bulge, low arm openness.
- SBc: Small central bulge, high arm openness.
- The Milky Way is classified as a barred spiral galaxy.
- About 66% of spiral galaxies are barred spirals.
Elliptical Galaxies
- Have an ellipsoidal shape and lack distinct features.
- Tend to contain the oldest stars.
- Classified by degree of ellipticity:
- E0: Least elliptical.
- E7: Most elliptical.
Lenticular Galaxies
- Intermediate between spiral and elliptical galaxies.
- Also referred to as S0 galaxies; they have used up most of their interstellar matter, with minimal star formation.
Irregular Galaxies
- Do not fit into any of the organized categories.
- Lack a distinct shape, often exhibiting chaotic structures.
Key Features
- Star formation predominantly occurs in the spiral arms of spiral galaxies.
- Central bulge of spiral galaxies harbors the oldest stars, illustrating a clear structure in star age distribution.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
Description
Test your knowledge about the Hubble Classification of Galaxies with these flashcards. Learn about different types of galaxies such as spiral, elliptical, and irregular, and understand the categorization established by Edwin Hubble. Perfect for astronomy enthusiasts and students alike!
