Across
- 3. "Where is everybody?"
- 5. Distance where liquid water can exist
- 7. Detects exoplanets by measuring the little "wobble" of a star caused by an orbiting planet's gravity
- 9. Region around a star where temperatures are "just right"
- 10. Substances, structures, or patterns that provide scientific evidence of past or present life
- 11. Astronomer who created a formula in 1961
- 13. A fissure on the seafloor that releases water heated by geothermal energy
Down
- 1. Pools of dangerous geochemistry
- 2. A technique for finding exoplanets by observing the periodic dimming of a star's light as a planet passes in front
- 4. Largest single mass of ice on Earth
- 6. What subject studies the origin, evolution, and future of life in the universe?
- 8. Live in harsh environments
- 12. A probabilistic formula used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy