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Questions and Answers
What is the Hubble Classification of Galaxies?
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)
Which of the following are classes of galaxies? (Select all that apply)
- Barred Spiral (correct)
- Elliptical (correct)
- Spiral (correct)
- Quadratic
What type of galaxy comprises 60% of all galaxies and usually has the youngest stars?
What type of galaxy comprises 60% of all galaxies and usually has the youngest stars?
Spiral Galaxy
What is a Lenticular Galaxy?
What is a Lenticular Galaxy?
What does 'Sa' refer to in classification?
What does 'Sa' refer to in classification?
What does 'Sc' refer to in classification?
What does 'Sc' refer to in classification?
What does 'SBa' refer to in classification?
What does 'SBa' refer to in classification?
What does 'SBc' refer to in classification?
What does 'SBc' refer to in classification?
What does 'E0' refer to in classification?
What does 'E0' refer to in classification?
What does 'E7' refer to in classification?
What does 'E7' refer to in classification?
What is another name for S0 galaxies?
What is another name for S0 galaxies?
What is the shape of the Hubble classification of galaxies often referred to as?
What is the shape of the Hubble classification of galaxies often referred to as?
What type of galaxy tends to have the oldest stars?
What type of galaxy tends to have the oldest stars?
What is a Barred Spiral Galaxy?
What is a Barred Spiral Galaxy?
What characterizes an Irregular Galaxy?
What characterizes an Irregular Galaxy?
What type of galaxy is the Milky Way?
What type of galaxy is the Milky Way?
Where are the star formation regions located in spiral galaxies?
Where are the star formation regions located in spiral galaxies?
Where are the oldest stars in spiral galaxies found?
Where are the oldest stars in spiral galaxies found?
What is the approximate percentage of spiral galaxies that are barred spirals?
What is the approximate percentage of spiral galaxies that are barred spirals?
What type of galaxy is represented by E?
What type of galaxy is represented by E?
What type of galaxy is represented by I?
What type of galaxy is represented by I?
What type of galaxy is represented by S?
What type of galaxy is represented by S?
What type of galaxy is represented by L?
What type of galaxy is represented by L?
What type of galaxy is represented by SB?
What type of galaxy is represented by SB?
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.
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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!
