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Across 1. _______ Theory: The moon was formed somewhere else and later captured by the gravitational field of the Earth 4. A system of 2 stars that revolve around each other (2 Words) 7. Eclipse occurs if the moon has an _____ fall on it 8. When a neutron star collapses it usually produces what? 10. Results from massive stars exploding violently 12. Type of Spectra (2 Words) 13. Massive "clouds" of gas 14. A change in the observed frequency of a wave, as of sound or light, occurring when the source and observer are in motion (2 Words) 17. An important use of stars 19. Distance that light travels in one year (2 Words) 20. Gravity causes particles in a nebula to move ______ 21. The moon is 3476km in _______ 24. When the sun, moon and earth are in line, _____ tides occur 25. Term used when talking about the brightness of stars 27. Full Moon moving towards New Moon 28. The first sign of the zodiac 29. Rapidly rotating core of a neutron star 30. A planet visible to the naked eye from Earth

Down 2. One of the stars in Orion's Belt 3. Distance between stars is very ______ 5. Earths next door neighbour (2 Words) 6. A type of galaxy 9. Actual brightness of a star 11. A major crater on the moon 15. Actual name of the North Star 16. Earths neighbour galaxy 18. 70% of a star is made up of this 22. The tides on Earth are linked to the ____ 23. One of the first men on the moon 24. Spectroscopes enable astronomers to find temperature, composition and ______ 26. Nebulae containing millions to billions of stars 27. New Moon moving towards Full Moon