Moon and Sun

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Across
  1. 3. The inner layers of the sun’s atmosphere
  2. 6. Between 4.2 and 4.5 billion years ago.
  3. 8. The fourth state of matter; found on the sun and fluorescent light bulbs.
  4. 9. Dark spots on the photosphere of the sun that rotate across the surface.
  5. 11. The visible surface of the sun.
  6. 12. The study of the universe
Down
  1. 1. The process in which mass is converted to energy.
  2. 2. A rocky or icy fragment that travels through space
  3. 4. A bowl shaped depression formed from the impact of a meteorite
  4. 5. The sun’s thin outer atmosphere is a millionth the brightness of the photosphere
  5. 7. Extensive dark basins on the moon formed by lava.
  6. 10. Electrically charged particles that stream off the corona of the sun.
  7. 12. 17 Mission to the moon that brought back rock samples