Across
- 2. A network of gullies and ravines that 19th-century scientists erroneously believed to be the product of an intelligent, water-seeking civilization.
- 3. The non-profit research organization whose mission is to explore, understand, and explain the origin and nature of life in the universe.
- 4. The apparent contradiction between the lack of evidence for extraterrestrial life and various high estimates for their probability.
- 5. The 1997 classic sci-fi comedy that follows a secret organization that monitors extraterrestrial life on Earth.
- 8. 39 members of this cult committed suicide in 1997 because they were convinced that an alien spacecraft was hidden behind a comet.
- 10. The name of the cave in France that some believe features drawings from 10,000 BC that depict a prehistoric UFO.
Down
- 1. This type of UFO was observed by hundreds of people in Belgium in 1989-1990, and by 20,000-30,000 people in Nevada and Arizona in 1997.
- 6. Thousands of Americans have taken out insurance against these.
- 7. The names of the two aliens who frequently appear in the Simpsons Treehouse of Horror episodes.
- 9. The planet often referred to as the “Alien Planet.”