Group Activity: Time to Move On. A common theme in science fic-tion is “leaving home” to find a new planet for humans to live on. Now that we know about thousands of planets, we can start imag-ining how to choose. Note: You may wish to do this activity using the same four roles described in Chapter 1, Exercise 39.
a. Make a list of characteristics that you would look for in a planet that might make a good home.
b. Examine the planets in Figure 10.13. Does this graph give enough information to determine which planets might make good homes, or poor ones? If not, what’s missing?
c. Suppose you also knew the orbital distance for each of the plan-ets in Figure 10.13. Would that make it easier to find potential good homes? Why or why not?
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Essential Cosmic Perspective
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