Milky Way Galaxy

What is the name of the region around outside of the milky way?

• The disc

• The halo

• The bulge

• The expanse

Where do we find the densest region of stars within the Milky Way?

• The bulge

• The halo

• The disk

• They are evenly distributed

Population I stars are ________ than Population II stars

• older

• younger

What is a Cepheid variable?

• a very large star to changes its brightness

• a small star that changes size

• a star in the constellation Cepheid

Think back to the lab. What variable led us to distance using the period of brightness spikes of the Cepheid variables?

• absolute magnitude

• mass

• surface temp

• radius

Where is the sun located in the Milky Way galaxy?

• near the center of the galaxy

• in the halo of the galaxy

• about 2/3s towards the edge

• in the nuclear bulge of the galaxy

What did we use to find the distance of objects very far away?

• OB stars

• supernovas

• Cepheid variables

Which population of stars are located in the disk with nearly circular orbits??

• Population I stars

• Population II stars

Where are population II stars found?

• not in the disk!

• in the disk

• 
  in the halo

Spiral Arms are easily seen because

• a dense molecular clouds

• OB associations stars

• atomic hydrogen clouds

• supernovas