Astro crossword puzzle

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Across
  1. 2. Competition between the US and SU
  2. 4. Keeps us from flying away
  3. 5. Longest day of the year
  4. 10. Shortest day of the year
  5. 11. Rocky planets
Down
  1. 1. Caused by Earth's rotation
  2. 3. Fire disaster
  3. 4. Big Gas planets
  4. 6. When rock fall into Earth's atmosphere
  5. 7. Caused by the Moon's gravity and Sun and Earth rotation
  6. 8. Space lab
  7. 9. Caused by Earth's tilt