The aspect ratio of thickness to width of the galactic disk is about:

The aspect ratio of thickness to width of the galactic disk is about:
 
  A) 1:2.
  B) 1:5.
  C) 1:10.
  D) 1:100.
  E) 1:1,000.

Question 2

What is the likely reason that we cannot find any examples of the first generation stars?
 
  A) The first generation stars are too faint to be visible now.
  B) The first generation stars formed such a long time ago that the light from them has not yet had time to reach us.
  C) The first generation stars were all very massive and exploded as supernova.
  D) The first generation stars formed with only H and He and therefore have no spectral features.
  E) We do not know how the first generation stars were formed.

Question 3

Large sunspots are larger than our whole planet.
 
  Indicate whether the statement is true or false

Question 4

An emission spectrum can be used to identify a(n):
 
  A) proton.
  B) electron.
  C) neutron.
  D) atom.
  E) neutrino.

Question 5

In the 1800s, many people assumed that Venus would have tropical temperatures, but instead it is very hot. Explain why tropical temperatures would have made sense given what was known in the 1800s, and why Venus instead turns out to be very hot.
 
  What will be an ideal response?

Question 6

The NASA orbiter that ultimately landed on the surface of the asteroid Eros was:
 
  A) New Horizons.
  B) Giotto.
  C) Stardust.
  D) NEAR Shoemaker.
  E) Clementine.