8.9 B Check#1

What type of galaxy is characterized by a flat, rotating disk containing stars, gas, and dust, and often has a central bulge surrounded by spiral arms?

• Elliptical Galaxy

• Spiral Galaxy

• Irregular Galaxy

• Lenticular Galaxy

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Which type of galaxy lacks a distinct shape and structure, often appearing chaotic?

• Spiral Galaxy

• Elliptical Galaxy

• Irregular Galaxy

• Barred Spiral Galaxy

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Identify the type of galaxy that is generally spherical or oval in shape and contains older stars with little gas or dust.

• Spiral Galaxy

• Elliptical Galaxy

• Irregular Galaxy

• Dwarf Galaxy

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Where is Earth's solar system located within the Milky Way galaxy?

• In the central bulge

• In the halo

• In one of the spiral arms

• In the outer ring

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Compare the characteristics of spiral and elliptical galaxies in terms of star formation and structure.

• Spiral galaxies have ongoing star formation and a defined structure, while elliptical galaxies have little star formation and a more uniform shape.

• Both have ongoing star formation and a defined structure.

• Elliptical galaxies have ongoing star formation and a defined structure, while spiral galaxies have little star formation and a more uniform shape.

• Both have little star formation and a more uniform shape.

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Explain why irregular galaxies do not fit into the standard classification of spiral or elliptical galaxies.

• They have a defined structure and ongoing star formation.

• They lack a defined shape and often appear chaotic.

• They are spherical and contain older stars.

• They have a central bulge and spiral arms.

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Which of the following best describes the Milky Way galaxy?

• An elliptical galaxy with little star formation

• A spiral galaxy with a central bulge and spiral arms

• An irregular galaxy with no defined shape

• A barred spiral galaxy with no central bulge

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What is the primary difference in star composition between spiral and elliptical galaxies?

• Spiral galaxies contain mostly older stars, while elliptical galaxies contain younger stars.

• Elliptical galaxies contain mostly older stars, while spiral galaxies contain a mix of young and old stars.

• Both contain mostly young stars.

• Both contain mostly older stars.

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Which of the following statements is true about the classification of galaxies?

• All galaxies are either spiral or elliptical.

• Galaxies can be classified as spiral, elliptical, or irregular.

• Irregular galaxies are a type of spiral galaxy.

• Elliptical galaxies have spiral arms.

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