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Across 1. A device used to detect radio waves from objects in space 4. The wave with the longest wavelength on the electromagnetic spectrum 8. All space and everything in it. 10. A lens that is thicker in the middle than at the edges 12. Our galaxy 13. Patterns of stars in the sky 14. A building with one or more telescopes 16. Light you can see with you eyes 18. Start system with two stars 20. The wave with the shortest wavelength on the electromagnetic spectrum 21. A reflecting telescope that orbits the Earth 22. When do most astronomers have to work 23. When as star is moving towards the Earth, its wavelength shortens, when this happens the spectrum shifts towards this color. 24. Distance between the crest of one wave and the crest of the next wave 25. Interstellar cloud of gas and dust 26. Type of telescope that uses a mirror

Down 1. When as star is moving away from Earth, its wavelength lengthens, when this happens the spectrum shifts towards this color. 2. Energy that can travel directly through space in the form of waves 3. Visible light has a very ____________ wavelength 5. Most stars are composed of 73% of this element 6. Galaxies that have no regular shape 7. Type of telescope that uses a convex lens 9. A galaxy looks like a flatten ball and has only old stars 11. An instrument that breaks down light from an object into colors 15. A cluster of hundreds of billions of stars 17. Our Star 18. The birth of the universe 19. A galaxy with outstreched arms