Across
- 6. Cloud of gas and dust in space
- 8. Instrument for viewing distant celestial objects
- 10. Earth's natural satellite
- 12. Light gas used in balloons
- 14. Luminous point in the night sky
- 15. Line where the sky meets the earth
- 16. Flying vehicle used for air travel
- 18. Time when the sky is dark
- 20. Spectrum of light appearing in the sky after rain
Down
- 1. Natural light display in polar regions
- 2. Visible mass of condensed water vapor
- 3. Object flown in the wind on a string
- 4. Color often associated with a clear sky
- 5. Streak of light from a falling space rock
- 7. Group of stars forming a pattern
- 9. Star at the center of our solar system
- 11. Outline of buildings against the sky
- 13. Celestial object with a glowing tail
- 17. Study of celestial objects and the sky
- 19. System of millions or billions of stars