Formation Theories of the Milky Way Galaxy

What are the two main theories about the formation of the Milky Way galaxy?

• Top-down and bottom-up

• North-south and east-west

• Left-right and up-down

• Inside-out and outside-in

According to the monolithic collapse hypothesis, what caused the large gas cloud to fragment?

• Magnetic fields

• Gravity

• Dark matter

• Wind

In the monolithic collapse hypothesis, what is the main component that forms the disk of the galaxy?

• Black holes

• Dark matter

• Metal-rich stars

• Low-density gas cloud

What is the main difference between Population I and Population II stars?

• Population II stars are metal-rich

• Population I stars are older

• Population I stars are metal-rich

• Population I stars are found in the halo

What recent evidence challenges the top-down hypothesis?

• Formation of black holes

• Existence of dark matter

• Presence of younger star clusters in the outer halo

• Discovery of new planets

What does the bottom-up hypothesis suggest about the formation of large galaxies?

• They formed from a single large gas cloud

• They formed from black holes

• They formed from the combination of smaller galaxies and star clusters

• They formed from dark matter

What process is responsible for the creation of metals in stars?

• Sublimation

• Metamorphosis

• Nucleosynthesis

• Photosynthesis

What happens to massive stars according to the bottom-up hypothesis?

• They live for a long time

• They turn into planets

• They burn through their fuel quickly and die in supernovae

• They become black holes

What does the bottom-up hypothesis propose about smaller galaxies?

• They formed independently

• They were destroyed by larger galaxies

• They were captured and added to larger galaxies

• They never existed

What is a key feature of the monolithic collapse hypothesis regarding the age of stars in the halo?

• Stars in the halo are metal-rich

• Stars in the halo are of roughly the same age

• Stars in the halo are younger

• Stars in the halo are completely metal-free