Exploring Galaxy Classifications

Who proved that galaxies are distant objects containing millions to billions of stars?

• Isaac Newton

• Galileo Galilei

• Edwin Hubble

• Albert Einstein

What are the three main categories in the Hubble classification system?

• Circular, Spiral, and Irregular

• Elliptical, Spiral, and Irregular

• Spiral, Circular, and Elliptical

• Elliptical, Circular, and Irregular

How are elliptical galaxies marked in the Hubble classification system?

• With the letter E

• With the letter S

• With the letter G

• With the letter I

What distinguishes barred spiral galaxies from regular spiral galaxies?

• They have no arms

• They have a bar shape in the center

• They are spherical

• They are irregular

What is a characteristic feature of irregular galaxies?

• They are completely round

• They do not fit into elliptical or spiral categories

• They have tightly wound arms

• They have a bar shape

What is the most common type of galaxy in the universe?

• Elliptical galaxies

• Spiral galaxies

• Irregular galaxies

• Dwarf galaxies

What is the main source of new star formation in spiral galaxies?

• The central bulge

• The thin rotating disc of stars

• The bar shape

• The elliptical structure

What do elliptical galaxies lack that prevents new star formation?

• Old stars

• Gas and dust

• A rotating disc

• A central bulge

What is the term used to describe the process of galaxies changing their appearance over time?

• Galactic Evolution

• Galactic Transformation

• Galactic Revolution

• Galactic Mutation

What can cause bursts of star formation in galaxies?

• Galactic isolation

• Galactic interactions and collisions

• Galactic aging

• Galactic shrinking