Sun, Moon, and Earth Systems

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Across
  1. 2. a bright streak that radiates from some craters on the moon's surface
  2. 6. an astronomical event that occurs when the sun, earth, and moon are aligned so that the moon blocks a portion of the sunlight falling on the earth
  3. 8. the sun's output of protons, electrons, and small atomic nuclei into the solar system
  4. 9. the line separating the light and dark sides of any astronomical body
  5. 13. the regular, repeatedly changing appearance of the shape of the lightened face of the moon visible from the earth
  6. 14. the hot outer atmosphere of the sun that extends far out into space to become solar wind
  7. 15. the process that powers stars
  8. 17. the spin of an object around its center of mass, such as the earth rotating about its axis
  9. 18. a broad, lowland plain on the moon made of hardened lava
  10. 19. a small, cool area on the sun's photosphere
Down
  1. 1. a stream of solar plasma that rises into the corona from the chromosphere and then gradually falls back
  2. 3. a unit of astronomical distance equal to the earth's average distance from the sun
  3. 4. the visible surface of the sun
  4. 5. orbital motion around a point, such as the earth revolving around the sun
  5. 7. an astronomical event that occurs when the sun, earth, and moon are aligned so that the earth clocks the sunlight falling on the moon
  6. 10. the lowest layer of the sun's atmosphere starting at the photosphere and extending out to 2000km from the surface
  7. 11. the entire range of electromagnetic wavelengths that the sun emits
  8. 12. the sun's apparent path among the stars as observed from Earth
  9. 16. a sudden explosion of the plasma from the sun's surface that emits a burst of energetic rays and particles into space
  10. 17. a long, narrow channel on a moon or planet that is believed to have originated from tectonic processes