Across
- 3. What stars and planets orbit
- 6. Europa and Enceladus have this in common
- 9. Has phosphine in its atmosphere
- 11. Has CHNOPS
- 12. Has an oxygen exosphere
- 13. Element signaling dramatic events in Earth history
- 18. Has a CO2-dominated atmosphere
- 19. Has liquid at its surface
- 20. May have more than one subsurface ocean
- 21. Has water ice
- 22. Site of KT impact
- 23. Allows us to characterize exoplanet atmospheres
- 25. Saw a major increase in biodiversity
- 27. Reflectivity
- 28. Star system with multiple HZ planets
- 29. Hosts the Galilean moons
Down
- 1. Proposed phospholipid alternative
- 2. Time of Earth's worst extinction
- 4. Made of sulfuric acid on Venus
- 5. Maybe the consequence of melting
- 7. Continent with Siberian Traps
- 8. Our Sun
- 10. Used for direct imaging of exoplanets
- 11. Used to view Earth as if its an exoplanet
- 14. Has a large tidal bulge
- 15. Only found on sterile worlds
- 16. Messed up the Viking experiments
- 17. Has a heavily cratered surface
- 24. When a planet blocks starlight
- 26. Made of iron oxides
- 30. Has silicate weathering feedback