Across
- 2. Space rock that reaches Earth’s surface
- 6. Distance light travels in one year
- 9. To make a planet suitable for life
- 10. Object that travels around a planet
- 12. Building used for studying space
- 13. Huge system of stars, planets, and dust
- 14. Extremely bright object powered by a black hole
- 16. Layer of gases surrounding a planet
- 18. Massive exploding star
- 19. Life originating beyond Earth
- 20. The path an object follows around another object
Down
- 1. Russian astronaut
- 3. Event where one object blocks another in space
- 4. Force pulling objects toward each other
- 5. Theoretical shortcut through space and time
- 7. Giant cloud of gas and dust in space
- 8. Recognizable pattern of stars
- 11. Device used to observe distant objects in space
- 15. Center point of a black hole
- 17. Rocky object orbiting the sun