The Sun, the Moon and Stars

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Across
  1. 3. the outer most layer of the Sun
  2. 4. dark, flat areas on the Moon formed from lava 3-4 billion years ago
  3. 5. type of galaxy with no regular shape, contains young stars
  4. 7. patterns of stars in the night sky
  5. 9. instrument scientists use to study the range of wavelengths a star emits
  6. 12. as the Sun dies it will swell to this
  7. 13. layer of the Sun where photons move to
  8. 15. a huge group of single stars, systems, clusters, dust and gas bound by gravity
  9. 17. type of galaxy with bulge in middle and spiral arms
  10. 18. type of galaxy that is round or flattened and contains only old stars
  11. 20. type of galaxy that is young and active with a black hole at its center
Down
  1. 1. the coolest layer of the Sun
  2. 2. describes phases of the Moon where more of the illuminated side is seen each night
  3. 6. the type of eclipse when the Moon moves into Earth's shadow
  4. 8. measure of the amount of light a star gives off
  5. 10. the type of eclipse when the Moon's shadow appears on Earth's surface
  6. 11. large, round pits on the Moon caused by impacts of meteoroids
  7. 14. describes phases of the Moon where less of the illuminated side is seen each night
  8. 16. oldest, most highly-cratered regions on the Moon
  9. 19. inner most layer of the Sun that is 15.6 million degrees Celsius, nuclear fusion converts hydrogen into helium