Crash Course Galaxies

What are the two competing ideas about the Universe mentioned in the video?

• That the Milky Way is the only galaxy

• That the Milky Way is just one of many galaxies

• Both a and b

• None of the above

Who were the two astronomers debating the size of the Universe?

• Edwin Hubble and Milton Humason

• Harlow Shapley and Heber Curtis

• Albert Einstein and Isaac Newton

• Stephen Hawking and Carl Sagan

What type of stars were crucial in determining the distance to the Andromeda Galaxy?

• Red giants

• Pulsating stars

• White dwarfs

• Supernovae

How many major types of galaxies are mentioned in the video?

• Two

• Three

• Four

• Five

What is a characteristic of elliptical galaxies?

• They are flat and spiral in shape

• They have no overall structure and are populated with older stars

• They are always small

• They are mostly made of gas and dust

What happens when galaxies collide?

• They merge and create new stars

• They explode

• They become smaller

• They break apart into smaller galaxies

Which type of galaxy is known for its strange and distorted shapes?

• Elliptical galaxies

• Spiral galaxies

• Peculiar galaxies

• Irregular galaxies

How do irregular galaxies often appear?

• They are perfectly shaped

• They are chaotic and shapeless

• They are always large

• They are always bright

What is the Tarantula Nebula known for?

• Being the largest galaxy

• Being an active star-forming region

• Being a black hole

• Having no stars

What does the video suggest about our understanding of the Universe?

• It is complete and perfect

• It is constantly evolving as we learn more

• It is mainly focused on the Milky Way

• It has remained unchanged for centuries