a. an electron

b. a UV photon

c. a black body radiation

d. a photon with the same frequency at which it was emitted.
 
 

2. Distance modulus is:

a. the sum of all distances to globular clusters

b. the distance to a galaxy using variable stars

c. the distance to a star derived from its peak intensity in Wien’s law

d. the difference between the magnitude of a star at 10 pc and its apparent magnitude
 
 

3. The histogram of globular cluster distribution reveals that the clusters are

a. distributed evenly throughout the sky

b. concentrated at a declination of 20 degrees south of the celestial equator

c. concentrated at a declination of 50 degrees south of the celestial equator

d. observable to our south whenever the milky way is in the sky
 
 

4. When the Right Ascention clamp on the telescope is released it allows the telescope to be freely moved

a. from north to south

b. from east to west

c. along the path of the star Sirius in the night sky

d. in a direction that can be determined by the TA at the beginning of the observation.
 
 
 
 
 
 
 
 

5. Harlow Shapley discovered that globular clusters

a. hover above the galactic bulge, but not below the bulge

b. are not isotropically distributed

c. follow an elliptical orbit around the sun

d. are made of active galaxies
 
 

6. Cepheid variables that have a shorter period are _______ than cepheids that vary slowly

a. hotter

c. dimmer

d. residing in a more highly curved part of space
 
 

7. If we knew the size of a typical spiral galaxy we could use that knowledge to determine

a. the temperature of all stars in that galaxy

b. the distance to other spiral galaxies

c. the speed at which a globular cluster is moving away from that galaxy

d. the rotational speed at which the spiral was formed
 
 

8. Matter that falls onto a supermassive black hole in the center of an active galaxy gets

a. swallowed by the black hole without trace

b. to move so fast that it turns to light

c. so dense that it turns into tiny white dwarfs

d. so hot that it emits X-rays
 
 

9. Jets that emerge from some active galactic centers produce

a. lobes that extend to ten times the radius of the host galaxy

b. neutrinos that may be seen by the next generation of neutrino detectors in the Sunbury observatory in Ontario

c. laser – like effects that tend to ionize the inter galactic medium

d. lobes that shine gamma rays.
 
 

10. If the universe was uniformly filled with stars, infinite in size and infinite in age then

a. the value of the gravitational constant would be much smaller the one we measure in labs

b. the night sky would be bright

c. the rate of star formation would be much higher than what we see in our universe

d. the gravitational pull by all the stars in the sky would force the universe to expand.