Space and Stars

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Across
  1. 1. A hot ball of glowing gas in space
  2. 3. The star at the center of the solar system
  3. 4. The center of a galaxy
  4. 6. Astronomical Unit
  5. 7. A scientist who studies stars, planets, and other objects in space
  6. 8. How far light travels in one year
  7. 10. The shape of our galaxy
Down
  1. 2. What scientists use to learn about space
  2. 3. The area beyond earth
  3. 5. The name of our planet
  4. 9. A group of hundreds of billions of stars