Galaxy Types and Characteristics

What is a galaxy?

• A single star with its planets.

• A system of millions or billions of stars held together by gravitational attraction between gas and dust.

• A large cloud of gas and dust without stars.

• A collection of asteroids orbiting a planet.

Edwin Hubble's classification scheme primarily categorizes galaxies into which two main types?

• Dwarf and Irregular

• Ring and Starburst

• Elliptical and Spiral

• Lenticular and Ultra Diffuse

What are the three main components that make up a spiral galaxy?

• Core, Arms, and Outer Rim

• Bulge, Disk, and Halo

• Nucleus, Rings, and Dust Lanes

• Center, Spirals, and Clusters

How can you distinguish a barred spiral galaxy from a normal spiral galaxy?

• Barred spiral galaxies have more stars.

• Normal spiral galaxies have a bar-shaped structure through their center.

• Barred spiral galaxies have a bar-shaped structure through their center.

• Normal spiral galaxies have brighter arms.

Which of the following is a typical characteristic of elliptical galaxies?

• They are usually composed of younger, bluer stars.

• They have distinct spiral arms.

• New star formations are commonly happening within them.

• They are typically composed of older stars.

What is a defining feature of irregular galaxies?

• They are always larger than spiral galaxies.

• They have a clear, symmetrical shape.

• They have no regular or symmetrical shape.

• They contain only old, red stars.

What is the typical number of stars found in a dwarf galaxy?

• Less than 1 million stars.

• Between 1 million and a billion stars.

• Billions of stars, similar to the Milky Way.

• Trillions of stars.

What is a distinctive visual characteristic of a ring galaxy?

• A prominent bar-shaped structure in its center.

• A circular appearance of light with no spiral arms attached to the core.

• A highly elongated, football-like shape.

• A chaotic and undefined structure.

What type of galaxy is Hoag's Object?

• Spiral galaxy

• Elliptical galaxy

• Ring galaxy

• Irregular galaxy

Which characteristic is typical of a starburst galaxy?

• Very low rate of star formation

• Contains mostly older, red stars

• Exceptionally high rate of star formation

• Has a smooth, oval shape