Astrobiology

1. The zone where temperatures are just right for life
4. is an ongoing international project directed by the International Planetary society.
6. What demonstrated terrestrial origin.
7. The area of a massive 300km explosion from a fragment of a comet.
8. a space observatory launched by NASA to discover Earth-size planets orbiting other stars.
10. Planets we consider this have low radiation levels,liquid water, and appropiate temperatures.
11. The Kepler space observatory was sent to search for these.
14. The belief that organic building blocks did not originate on Earth but were brought here by comets or possibly meteors.
15. The belief that life on Earth naturally arose from early chemical conditions on Earth.

2. When species evolve into a common form due to a common need.
3. When an animals biology changes due to selective pressure.
5. a mathematical argument used to arrive at an estimate of the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy.
9. A spacecraft that landed on the comet 67P/Churyumov–Gerasimenko.
12. The study of potential life in the universe.
13. An improved space observatory, with a similar mission to the Kepler.