Discuss the theme of science and invention in these stories. Are inventions always positive things? Is Science always good? Which advancements are seen as being beneficial for humanity and which are not? Why do you think this is?

Why does the author choose to set three of his stories on Mars? What does Mars represent and how is it different from other settings in the collection?

How does the author explore the Space Age, space travel and everything that it implies? What atmosphere and feelings does he create? What does space flight mean for mankind? What do you think the author's opinion of space travel is?

Discuss the theme of faith in these stories. What is faith and who has it? What different kinds of faith are there? What are the obstacles to faith? Is faith a good thing?

How does the author explore...