Astronomy I

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Across 1. Energy that can travel directly through space in the form of waves 5. A lens that is thicker in the middle than at the edges 6. The wave with the longest wavelength on the electromagnetic spectrum 7. An instrument that breaks down light from an object into colors 8. Our galaxy 10. Light you can see with you eyes 13. All space and everything in it. 16. Distance between the crest of one wave and the crest of the next wave 18. When as star is moving away from Earth, its wavelength lengthens, when this happens the spectrum shifts towards this color. 20. A galaxy looks like a flatten ball and has only old stars 22. Galaxies that have no regular shape 23. When do most astronomers have to work 25. When as star is moving towards the Earth, its wavelength shortens, when this happens the spectrum shifts towards this color. 26. Most stars are composed of 73% of this element 27. Our Star 28. Interstellar cloud of gas and dust

Down 2. Patterns of stars in the sky 3. A device used to detect radio waves from objects in space 4. A building with one or more telescopes 9. Start system with two stars 11. A reflecting telescope that orbits the Earth 12. Type of telescope that uses a convex lens 14. A cluster of hundreds of billions of stars 15. Type of telescope that uses a mirror 17. The wave with the shortest wavelength on the electromagnetic spectrum 19. A galaxy with outstreched arms 21. The birth of the universe 24. Visible light has a very ____________ wavelength

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