1. From the physical world to the biological universe: Democritus to Lowell.
2. Life in the solar system.
4. Extraterrestrials in literature and the arts: the role of imagination.
5. The UFO controversy and the extraterrestrial hypothesis.
6. The origin and evolution of life in the extraterrestrial context.
7. SETI: the search for extraterrestrial intelligence.
8. The meaning of life: implications of extraterrestrial intelligence.
9. Summary and conclusion: the biological universe.
