Mecury

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Across
  1. 4. the spinning of a planet on its axis
  2. 6. mercury's extremely thin outer layer of gases
  3. 7. an invisible force field that surrounds a planet
  4. 8. a bowl shaped depression made by an asteroid or comet impact
  5. 9. path a planet follows as it travels around the sun
Down
  1. 1. a very large crater formed by a major collision
  2. 2. the amount of heat present on a planet's surface
  3. 3. energy and heat emitted from the sun
  4. 5. amount of matter packed into a specific volume
  5. 8. the center of a planet