This is Form A.

1. What is the main reason we want to know how many Earthlike planets there are?
   a) we wish to colonize other places
   b) we are curious if we are alone in the universe
   c) we wish to mine the kinds of raw materials we find on Earth
   d) we are curious if people are really being abducted by aliens
   
   
   
2. In relativity, if I and everyone else are astronauts in empty space, then I think my watch is running
   a) faster than everyone else's watch
   b) slower than everyone else's watch
   c) faster than those moving faster than me, slower than those moving slower
   d) slower than those moving faster than me, faster than those moving slower
   
   
   
3. Mars is being explored because of strong evidence that it
   a) once had an intelligent civilization that created canals
   b) once had a water cycle with rivers and rain
   c) has microbial life living under its surface
   d) has an environment suitable for human habitation
   
   
   
   
4. Which moon of Jupiter seems the most promising for finding life?
   a) Io
   b) Europa
   c) Ganymede
   d) Callisto
   
   
5. The most common molecule in the air in your lungs right now has what important biological function?
   a) it is helping you hold up the atmosphere above you
   b) it is involved in life-giving chemistry in your body
   c) it maintains enough of a greenhouse effect to keep Earth warm
   d) it sustains photosynthesis in plants
   
   
   
6. Which of the following is not thought to be necessary to have before life can develop?
   (a) liquid water
   (b) carbon atoms
   (c) oxygen atmosphere
   (d) energy source
   
   
   
   
7. The anthropic principle asserts that
   (a) we cannot assume the Earth and Sun are typical
   (b) planets will tend to foster life if it is at all possible
   (c) it is unlikely that intelligent life exists anywhere else in our galaxy
   (d) the laws of physics apply in all reference frames
   
   
   
   
   
8. Of the following essential needs for life as we know it, which one most strongly limits the number of planets on which there could be life on the surface?
   (a) the existence of organic molecules
   (b) the presence of a suitable energy source
   (c) the need for a breathable atmosphere
   (d) the likelihood of finding liquid water
9. The number of rocky planets like Earth in our galaxy is probably
   (a) in the hundreds
   (b) in the thousands
   (c) in the millions
   (d) in the billions
   
   
   
   
10. What two things was Percival Lowell right about, but for all the wrong reasons?
    (a) Mars had flowing water in the past, Pluto exists
    (b) Mars has seasonal vegetation, Pluto exists
    (c) Venus is hospitable for humans, Mars has seasonal vegetation
    (d) there is intelligent life on Mars, and Mars had flowing water in the past
    
    
11. The exoplanets we are discovering suggest our solar system
    (a) is typical because there are no planets sizes between Earth and Neptune
    (b) is typical because it contains gas giants far from the star
    (c) is unusual because it contains both gas giants and Earthlike planets
    (d) is unusual because it contains rocky planets in the habitable zone
    
    
    
12. Einstein's theory of relativity asserts that
    everything is relative
    times and distances are absolute
    the speed of light is relative
    the speed of light is absolute
    Answers:
    1-4: babb
    5-8: acad
    9-12: dacd