A Solar System is Born

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Across
  1. 3. the thin and solid outermost layer of the
  2. 6. atoms combine to form a new, more
  3. 8. fusion the process by which nuclei of
  4. 11. that has a strong magnetic field
  5. 12. the motion of a body that travels
  6. 15. the path that a body follows as it travels
  7. 16. a large cloud of gas and dust in interstellar
  8. 17. along an orbit
  9. 18. nucleus; the process releases energy
  10. 21. another body in space; one complete
Down
  1. 1. which the sun and planets formed
  2. 2. a dark area of the photosphere of the
  3. 4. a region in space where stars are born
  4. 5. that is cooler than the surrounding areas
  5. 7. another body in space
  6. 9. the layer of rock between the Earth’s
  7. 10. the central part of the Earth below the
  8. 13. the spin of a body on its axis
  9. 14. and core
  10. 19. nebula a rotating cloud of gas and dust
  11. 20. above the mantle