Across
- 2. Distant object with intense brightness
- 5. Seventh brightest star in the night sky
- 6. Smallest planet in our solar system
- 8. Largest planet in our solar system
- 9. Telescope ocular
- 16. Star type that periodically brightens and dims
- 18. Lens system that focuses colors to one point
- 19. A large gravitationally bound accretion of stars
- 21. Force keeping orbits intact
- 22. Star cluster type, a spherical ball of stars
- 23. US space agency
- 24. Constellation known as "The Hunter"
- 25. The North Star
- 26. A ball of gas or solid orbiting a star
- 27. Morning and Evening planet
Down
- 1. Scientist who theorized universe expansion
- 3. Large Galaxy in our local group
- 4. Optical telescope using a lens or lenses
- 6. The red planet
- 7. Name of our own galaxy
- 10. Optical telescope using a mirror
- 11. Ball of ice and dust orbiting the sun
- 12. Mark left on a body by impact of a meteor or other
- 13. Cloud of interstellar gas
- 14. Demoted from a planet
- 15. Origin of many comets
- 17. Local planet with a system of rings
- 20. Of or pertaining to our moon