Astronomy Science crosswords

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Across
  1. 1. a giant cloud of dust and gas
  2. 3. used in a scale to signify something is going farther to something
  3. 5. what is our planet earth?
  4. 7. magnitude of how an object appears from the sky on earth
  5. 11. a diagram of absolute magnitudes
  6. 13. is the state of being luminous
  7. 14. groups stars are classified in
  8. 15. a small rock orbiting the sun
  9. 16. all of space and time including planets
  10. 17. galaxies that have no structure
  11. 19. a big bright light in a shape of a sphere in space
  12. 20. a circular-shaped galaxy
Down
  1. 2. the range of all types of EM radiation
  2. 4. the galaxy that includes our solar system
  3. 6. an icy,small solar system body that warms and begins to release gases when nearing the sun
  4. 8. the number of occurrences or repeating things of time
  5. 9. the big star that people oon earth see in the sky
  6. 10. used to signify that something is coming closer to something
  7. 12. a non-normal galaxy
  8. 18. the magnitude of an object with a standard distance of 10 parsecs