Astronomy puzzle

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Across
  1. 2. 4 of them every year
  2. 3. Humid
  3. 5. Orange colors
  4. 6. What the earth does 24/7
  5. 8. Increasing
Down
  1. 1. a year
  2. 3. Hot
  3. 4. Decreasing
  4. 7. Line in earth
  5. 8. cold