The Universe Vocabulary

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Across
  1. 6. a graph plotting star luminosity and temperature
  2. 8. huge group of stars, dust, gas, planets, and other objects bound together by gravity
  3. 9. galaxy shaped like a round or flattened ball
  4. 11. the distance that light travels in one year, about 9.46 trillion kilometers
  5. 12. the tendency of sound from a moving object to change frequency to a stationary observer
  6. 13. the amount of energy a star gives off from its surface
Down
  1. 1. galaxy that does not have a regular shape
  2. 2. a phenomenon in which the wavelengths of light from a source shifts to the red end of the spectrum
  3. 3. a theory that proposes that the universe formed in an instant in an enormous explosion
  4. 4. a well-tested explanation of an aspect of the natural world
  5. 5. galaxy that appears to have a bulge in the center and arms that spiral outward in a pinwheel pattern
  6. 7. all of space and everything in it
  7. 10. a giant ball of hot gas, made mostly of hydrogen and helium