Crosswords Puzzle

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Across
  1. 3. mass of hot burning gases
  2. 6. holds the planets in their place
  3. 8. days of equal day and night
  4. 9. imaginary line that splits Earth into two equal halves
  5. 10. largest nebula in the universe
Down
  1. 1. a day in a year when a place has either longest or shortest period of daylight
  2. 2. country which has the world's largest tropical rainforest
  3. 4. an emergent tree which grows in a tropical rainforest
  4. 5. dwarf planet
  5. 7. the length of time Earth takes to orbit the Sun