stem tristan

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Across
  1. 2. active young galaxies with black holes in the center
  2. 4. the closets planet to the sun
  3. 8. instruments scientist use to spread light into different wave lengths
  4. 10. sun centered
  5. 11. 3rd planet from the sun
  6. 12. when the moon is between the earth and the sun
  7. 13. round or flattened balls, old stars
Down
  1. 1. must orbit the sun
  2. 3. no regular shapes and bright young stars
  3. 5. made of mainley ice and gas
  4. 6. earth centered
  5. 7. the range of wave lengths that stars
  6. 8. has bulge in the middle and arms that spiral outward
  7. 9. made of mainly rock material
  8. 13. when the earth or moon casts a shadow on the other