Across
- 2. Unit of astronomical distance
- 7. A system of millions or billions of stars
- 8. A luminous sphere of plasma held together by its own gravity
- 9. A cloud of gas and dust in space
- 11. A group of stars forming a recognizable pattern
- 13. All existing matter and space considered as a whole; the cosmos
- 15. Person trained for space travel
- 17. Object that orbits another
- 18. Device used to observe distant objects
- 22. A stellar explosion that briefly outshines an entire galaxy
- 24. Galaxy that includes our solar system
- 25. Small body orbiting a larger one
- 26. A small rocky body orbiting the sun
- 27. A vehicle for driving over rough terrain, especially one driven remotely over extraterrestrial terrain
- 29. Relating to the moon
- 30. Theory explaining the origin of the universe
Down
- 1. Path of a celestial body or an artificial satellite as it revolves around another body
- 3. The force that attracts a body toward the center of the earth, or toward any other physical body having mass
- 4. Originating or located outside the earth or its atmosphere
- 5. A region of space having a gravitational field so intense that no matter or radiation can escape
- 6. A highly magnetized, rotating neutron star that emits beams of electromagnetic radiation
- 10. Shower of space rocks entering Earth's atmosphere
- 12. A vehicle designed for space travel
- 14. Relating to the sun
- 16. Protective garment worn by astronauts in space
- 19. A massively luminous celestial object
- 20. A celestial object consisting of a nucleus of ice and rock and a tail of gas and dust
- 21. Moon landing mission
- 23. Galaxy nearest to the Milky Way
- 28. Largest planet in our solar system