Galaxy

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Across
  1. 3. a classification system for stars based on their colour
  2. 5. large clouds of gas and dust floating in space
  3. 7. The number of complete waves that pass a given point in a certain amount of time
  4. 8. Galaxy that contains our Solar System. The name derives from its appearance as a dim "milky"
  5. 9. A ball of frozen dust and rock that orbits the sun and has a tail that glows
  6. 11. A ball of hot gas, primarily hydrogen and helium, that undergoes nuclear fusion.
  7. 14. the brightness of a star as seen from Earth
  8. 15. An object that orbits a star, is large enough to have become rounded by its own gravity, and has cleared the area of its orbit.
  9. 16. a graph that plots luminosity v. temperature of stars
  10. 18. The actual brightness of a star
  11. 19. brightness
  12. 20. the change in the wavelength of light due to an object moving away from the observer.
Down
  1. 1. A galaxy that does not have a regular shape
  2. 2. huge galaxy that is round or oval in shape
  3. 4. the range of wavelengths or frequencies over which electromagnetic radiation extends.
  4. 6. the displacement of the spectrum to shorter wavelengths in the light coming from distant celestial objects moving toward the observer.
  5. 10. Galaxy a galaxy with a bulge in the middle and arms that spiral outward in a pinwheel pattern
  6. 12. a small rocky body orbiting the sun
  7. 13. All of space and everything in it
  8. 17. A typical star that is the source of light and heat for the planets in the solar system.