space science

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Across
  1. 3. opposite of matter
  2. 7. that started the gravitational effect
  3. 8. change in wavelength or frequency
  4. 10. goes up
  5. 13. very intense gravity
  6. 14. interaction of electrical charges
Down
  1. 1. radiation era in the big bang
  2. 2. strong to weak
  3. 4. type of star that pulsates radially
  4. 5. average density of something
  5. 6. we live in one of these
  6. 9. hot or cold
  7. 11. distance
  8. 12. unit of measurement in temperature
  9. 15. study of space