Solar Syestem Crossword puzzle

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Across
  1. 2. Who tried to measure the speed of light?
  2. 4. what is the farthest planet to Earth?
  3. 6. What is the smallest planet in our solar system?
  4. 8. What is the coldest planet in our solar system?
  5. 10. What are the patterns in the night sky called?
Down
  1. 1. What is the warmest planet in our solar system?
  2. 3. What changes based on the amount of gravity being forced?
  3. 5. How do scientists measure the distance of stars?
  4. 7. what is the biggest planet in our solar system?
  5. 9. What causes the moon to light up?