Galaxies, part 1: Crash Course Astronomy #38

1. What did Harlow Shapley argue about the Milky Way?

• It is one of many galaxies.

• It contains all the stars in the universe.

• It is the only galaxy.

• It is smaller than other galaxies.

2. What was the significance of Edwin Hubble's observation of the Andromeda galaxy?

• It confirmed that all galaxies are the same size.

• b. It proved that the Milky Way is the only galaxy.

• It showed that the Andromeda galaxy is much farther away than previously thought.

• It revealed that galaxies are all colliding.

3. How do galaxies typically form their flat structures?

• By the explosion of stars.

• From clouds of gas collapsing and spinning.

• Through collisions with other galaxies.

• By random accumulation of stars.

4. 4. Which type of galaxy is characterized by a lack of gas and dust?
   

• Spiral

• Peculiar

• Elliptical

• Irregular

5. What happens during a galactic collision?

• Stars collide with each other.

• Gas clouds collide and form new stars.

• Galaxies merge instantaneously.

• No changes occur in the galaxies.

What characteristic defines irregular galaxies?

• They are always large and well-structured.

• They are shapeless and chaotically shaped.

• They have a perfect spiral structure.

• They are primarily made of stars.

3. What recurring theme is highlighted in the speaker's discussion?

• The Earth is the center of the Universe.

• Humans seem less significant in the vastness of the Universe.

• The Milky Way is the largest galaxy.

• All galaxies are interconnected.