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Across 2. Another name for flux 3. 12 constellations centered on the ecliptic 5. Part of a constellation 6. Color with a short wavelength 7. Failed star 9. Breaks up white light 10. How bright a star looks from Earth 14. Exploding star 16. Number of galaxies in our Universe 20. December 22nd 21. Color with a long wavelength 22. Element our Sun's burning

Down 1. Rate at which a star give off energy 2. Star that no longer transmits light 4. How bright a star really is 6. Another name for the spring equinox 7. Event Horizon 8. Closest star to our sun 11. Another name for the fall equinox 12. Interstellar gas and dust 13. A group of stars 15. Second closest star 17. Distance light travels in a year 18. Point directly above you in the night sky 19. Star with a low mass