Crash Course Galaxies I Interactive video

What was the main debate about the universe in 1920?

• Whether stars were made of gas or solid material

• Whether the Sun was the center of the universe

• Whether the Milky Way was the only galaxy or one of many

• Whether the Earth was flat or round

What type of galaxy is the Milky Way?

• Irregular

• Peculiar

• Spiral

• Elliptical

What are the main characteristics of elliptical galaxies?

• They have spiral arms and a central bulge

• They are flat and have a lot of gas and dust

• They are puffy, lack gas and dust, and contain older stars

• They have irregular shapes and are small

What happens when galaxies collide?

• They merge and form elliptical galaxies

• They pass through each other without any effect

• They explode and disappear

• They shrink and become smaller

What are the Large and Small Magellanic Clouds?

• Two elliptical galaxies

• Two peculiar galaxies formed by collisions

• Two irregular satellite galaxies of the Milky Way

• Two large spiral galaxies