Knowledge of the Universe

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Across
  1. 1. A space object with an icy tail
  2. 3. A star that stays fixed in the sky known as the North Star
  3. 5. One of the 2 mains elements of stars (starts with "H")
  4. 7. Galaxy we live in
  5. 9. The number of planets in our solar system
Down
  1. 2. When one celestial body blocks light from another, includes both lunar and solar
  2. 4. Nearest star to the Earth
  3. 6. The force that holds planets in their place
  4. 8. Unit of distance used to measure things in space